This is nonsense gish gallop.

Xinjiang

Uyghurs are not being tortured and killed.

The best and most comprehensive resource I have seen so far is Qiao Collective's Xinjiang: A Resource and Report Compilation. Qiao Collective is explicitly pro-PRC, but this is an extremely comprehensive write-up of the entire background of the events, the timeline of reports, and real and fake claims.

I also recommend reading the UN report and China's response to it. These are the most relevant accusations and responses without delving into straight up fantasy like Adrian Zenz, professional propagandist for the Victims of Communism Foundation, does.

Tourists do go to Xinjiang all the time, yes. You can watch videos like this one on YouTube, though it obviously isn't going to be a comprehensive view of a complex situation like this.

Tibet

Tibet was a feudal slave society backed by the CIA. The PLA liberated Tibet. Friendly Feudalism: The Tibet Myth:

Drepung monastery was one of the biggest landowners in the world, with its 185 manors, 25,000 serfs, 300 great pastures, and 16,000 herdsmen. The wealth of the monasteries rested in the hands of small numbers of high-ranking lamas. Most ordinary monks lived modestly and had no direct access to great wealth. The Dalai Lama himself “lived richly in the 1000-room, 14-story Potala Palace.” [12]

Secular leaders also did well. A notable example was the commander-in-chief of the Tibetan army, a member of the Dalai Lama’s lay Cabinet, who owned 4,000 square kilometers of land and 3,500 serfs. [13] Old Tibet has been misrepresented by some Western admirers as “a nation that required no police force because its people voluntarily observed the laws of karma.” [14] In fact it had a professional army, albeit a small one, that served mainly as a gendarmerie for the landlords to keep order, protect their property, and hunt down runaway serfs.

Young Tibetan boys were regularly taken from their peasant families and brought into the monasteries to be trained as monks. Once there, they were bonded for life. Tashì-Tsering, a monk, reports that it was common for peasant children to be sexually mistreated in the monasteries. He himself was a victim of repeatedremoved, beginning at age nine. [15] The monastic estates also conscripted children for lifelong servitude as domestics, dance performers, and soldiers.

In old Tibet there were small numbers of farmers who subsisted as a kind of free peasantry, and perhaps an additional 10,000 people who composed the “middle-class” families of merchants, shopkeepers, and small traders. Thousands of others were beggars. There also were slaves, usually domestic servants, who owned nothing. Their offspring were born into slavery. [16] The majority of the rural population were serfs. Treated little better than slaves, the serfs went without schooling or medical care. They were under a lifetime bond to work the lord’s land — or the monastery’s land — without pay, to repair the lord’s houses, transport his crops, and collect his firewood. They were also expected to provide carrying animals and transportation on demand. [17] Their masters told them what crops to grow and what animals to raise. They could not get married without the consent of their lord or lama. And they might easily be separated from their families should their owners lease them out to work in a distant location. [18]

As in a free labor system and unlike slavery, the overlords had no responsibility for the serf’s maintenance and no direct interest in his or her survival as an expensive piece of property. The serfs had to support themselves. Yet as in a slave system, they were bound to their masters, guaranteeing a fixed and permanent workforce that could neither organize nor strike nor freely depart as might laborers in a market context. The overlords had the best of both worlds.

One 22-year old woman, herself a runaway serf, reports: “Pretty serf girls were usually taken by the owner as house servants and used as he wished”; they “were just slaves without rights.” [19] Serfs needed permission to go anywhere. Landowners had legal authority to capture those who tried to flee. One 24-year old runaway welcomed the Chinese intervention as a “liberation.” He testified that under serfdom he was subjected to incessant toil, hunger, and cold. After his third failed escape, he was merciless beaten by the landlord’s men until blood poured from his nose and mouth. They then poured alcohol and caustic soda on his wounds to increase the pain, he claimed. [20]

The serfs were taxed upon getting married, taxed for the birth of each child and for every death in the family. They were taxed for planting a tree in their yard and for keeping animals. They were taxed for religious festivals and for public dancing and drumming, for being sent to prison and upon being released. Those who could not find work were taxed for being unemployed, and if they traveled to another village in search of work, they paid a passage tax. When people could not pay, the monasteries lent them money at 20 to 50 percent interest. Some debts were handed down from father to son to grandson. Debtors who could not meet their obligations risked being cast into slavery. [21]

The theocracy’s religious teachings buttressed its class order. The poor and afflicted were taught that they had brought their troubles upon themselves because of their wicked ways in previous lives. Hence they had to accept the misery of their present existence as a karmic atonement and in anticipation that their lot would improve in their next lifetime. The rich and powerful treated their good fortune as a reward for, and tangible evidence of, virtue in past and present lives.

-Dr. Michael Parenti

Tian'anmen

Of the few hundred people that died in the riots and fighting, the square was dispersed peacefully. The truth about Tian'anmen is that hundreds of protestors and PLA officers were killed in Beijing that day as the PLA advanced towards the square, but that the square itself was evacuated peacefully, which matches leaked US cables and the CPC's official stance on what it calls the "June 4th incident". This is a rejection of the commonly reported story of 10,000 people being killed on the square itself, which originated from a British diplomat's cable. Said diplomat was later confirmed to have evacuated well before.

Western nations intentionally sensationalize the quantity of deaths and the character of the events. This is also why Western Nations don't frequently report on the South Korean Gwang-Ju massacre that occured around the same era, where the South Korean millitary murdered thousands of High School and College students protesting against Chun Do-Hwan's dictatorship. All of what I said is backed up by the Wikipedia page for Tian'anmen Square Protests and Massacre, such as Alan Donald revising his estimate from 10,000 to the low thousands yet BBC continuing to report the 10,000 figure:

In a disputed cable sent in the aftermath of the events at Tiananmen, British Ambassador Alan Donald initially claimed, based on information from a "good friend" in the State Council of China, that a minimum of 10,000 civilians died,[237] claims which were repeated in a speech by Australian Prime Minister Bob Hawke,[238] but which is an estimated number much higher than other sources provided.[239][240] After the declassification, former student protest leader Feng Congde pointed out that Donald later revised his estimate to 2,700–3,400 deaths.

Democracy

The form of democracy and the mode of production in China ensures that there is a connection between the people and the state. Policies like the mass line are in place to ensure this direct connection remains. This is why over 90% of the Chinese population supports the government, and why they have such strong perceptions around democracy.

The Chinese political system is based on whole-process people's democracy, a form of consultative democracy. The local government is directly elected, and then these governments elect people to higher rungs, meaning any candidate at the top level must have worked their way up from the bottom and directly proved themselves. Moreover, the economy in the PRC is socialist, with public ownership as the principle aspect of the economy. Combining this consultative, ground-up democracy with top-down economic planning is the key to China's success.

I highly recommend Roland Boer's Socialism in Power: On the History and Theory of Socialist Governance. Socialist democracy has been imperfect, but has gone through a number of changes and adaptations over the years as we've learned more from testing theory to practice. Boer goes over the history behind socialist democracy in this textbook.