[troad]

That's a lot of what ifs, some more fanciful than others. There is no political system that could withstand a such a barrage of bad intentions and corruption. But I'd note that despite how bad things seem, the things you describe for the most part haven't actually happened? The executive is generally complying with SCOTUS decisions, e.g. tariffs. The US remains a robust if fractious democracy, unlike much of the rest of the world.

More broadly, go look at other countries' politics. The facade of stability is being held up in a lot of places by restrictions on speech, on assembly, on political organisation of a kind that would be unthinkable in the US. It's borderline illegal to assemble for Palestine in Britain. Is that society less divided than the US, or just more controlled? And that's a democratic peer country. Things get much worse - Hungary, Russia, Iran, etc