I'm not saying that UAP are definitively from aliens. There's not enough evidence available to the public to support that claim. I'm saying I don't believe that is as outlandish as it sounds at face value, once you consider the information confirmed by members/agencies of the U.S. government.

People are rejecting this topic as crazy due to the stigma, not due to lack of evidence supporting the existence of UAP. I don't present evidence of aliens; I present evidence of crafts that represent breakthrough technology.

What I was trying to get at is that a non-human intelligence isn't out of the question to explain the technology that is still ahead of our tech now in 2023, but has been confirmed to exist at least since 1947.

Even if that is human tech that was witnessed starting in 1947, it should be deeply concerning that a nation secretly possesses technology that superior to any publicly known modern day aircraft.

There's a lot to my write-up on the topic. It's overwhelming, but it's factual information that is thoroughly cited from valid sources. I don't talk about unfounded claims or abductions or anything like that.

Edit: This section might be more for you:

For the individuals that will not have the interest or patience to read this detailed information, I strongly recommend this National Geographic documentary: UFOs: Investigating the Unknown on Hulu. The first few episodes are available for free on Youtube.

That documentary is not like the History Channel's big-haired nonsense...

I realize I didn't answer your question about why would governments conceal it.

It makes a lot of sense for our governments to conceal technology to have an edge against adversaries should a major conflict arise. The element of surprise is very powerful, and suddenly deploying technology that an adversary doesn't know how to/doesn't have an existing plan to counter is highly valuable.

Concealing technological developments also makes it more challenging for adversaries to replicate our tech.

The reason for the historical concealment from the public goes back to the Robertson Panel, who decided that while UFO/UAP represent no direct threat, they believed that public awareness could lead to ontological crises for the highly religious country at that time. They also believed that it served as a vulnerability that the Soviets could use to instill mass panic (think of the War of the Worlds radio broadcast panic).

So the Robertson Panel recommended concealing the information on UFO/UAP and initiating a 'public information campaign' to reeducate our population and to stigmatize the subject. They were very successful and this stigma still remains, as exemplified in the users who downvote factual information because they'd rather engage in confirmation bias and denial.

Everyone can read the declassified report on the Robertson Panel yourselves too. This is all verifiable, valid declassified government records.