Revolution is the only solution. Even if USians managed to elect a really good reformist, the dominant class will not take lightly to that. We take the path of revolution not because we want it, but because it's the path the bourgeoisie forces us to take, they will simply not allow you to meddle too much with their system without consequences, and will fight to keep it in place, just like the monarchies of the past fought these same bourgeoisie that violently took the power away from them to establish themselves as the new status quo.
Also, the US is a constant threat to leftists abroad, just need to look at Chile on 09/11/1971, when democratically elected socialist Salvador Allende was killed in a US-backed military coup that installed neoliberal dictator Pinochet into power, which is further proof of the problems of electoralism, but on an international scale.
You genuinely should read marxist theory. Comrade Cowbee have a great starting guide.
You're taking the definition linked at face value and not doing further investigation into what it means and its material repercussions.
In a capitalistic society capital and the right to private property is above all, including the individual, it is by all means sacred and must be respected. This means that despite having more empty homes than homeless people, these people can't be located into these empty homes because the property is above them, they don't matter.
The supposed "rights of the individual" is just the individualization of the self in detriment of the collective. Despite us being social animals that depend on each other, said rights and constant capitalistic propaganda sells us the idea that we are single individuals that are responsible for everything around us. Phrases like "If you get get fired its your own fault and you should pull yourself by your own bootstraps", "if you get sick that's your own fault", "if you become homeless that's your own fault", etc. It's never the system in place that prioritizes profit and private property above you. It also doesn't matter that someone is racist because that's their individual right of free speech, despite that hurting society as a whole, it's the individual above the collective.
"Liberty" for who? If your choice is to pay rent or be homeless, that's not a choice. If you have to worry about keeping a roof above your head, not getting fired, if you can pay your bills, if you can afford food, then you're not free. The only ones that are free are the bourgeoisie, as they hold all the power in a capitalistic society.
The Republicans maintain capitalism, just like Democrats do. They are both liberals because liberalism is the status quo of capitalism. Of course there is neoliberalism too, but as the name implies, it is a "new" type of liberalism. They are by all metrics liberals. Further right than the Democrats, sure, but liberals none the less. They fit into defending the things I explained above, just like the Democrats also do.
I'm literally talking to you from a marxist instance. I don't claim to know everything about capitalism, but I do think I have a better grasp than most liberals on this.
Furthermore, what do you mean with distinguishing ideology from party and individual? Ideology is present in both these things. Capitalistic liberal ideology as the status quo, maintains itself by being ever present in the collective mind of the people as the only viable solution. You can't separate these things because they are deeply interlinked, both the individual and the party are not separated from ideology.
No, a genocide doesn't stop being wrong when the genocided population have rights. Also you completely ignore Palestine as a country, which grants the Palestinians rights, even tho Israel doesn't since it is a settler colonial genocide entity.
Anyone with a shred of empathy supports Palestine. The question of a liberal supporting Palestine or not on ideological grounds is settled in if the liberal believes in the legitimacy of Israel or not, and anyone that does believe that, doesn't support Palestinians in any way whatsoever.
Israel is not a legitimate state, it was a settler colonial project from its very inception. That's why we have 75+ years of a genocide happening that the world brushes off and does nothing about.