Capitalism only works on a small scale. The second society gets bigger, you require a state with militaristic presence to keep corporations in line.

Wrong. Half of europe relied so much on american protection that they had barely any military spending. Germany at the forefront, we only have ammunition for like 2 days of combat. So ye, that's nonsense.

No matter which country you pick, large ones like the USA or Russia, all of them have developed into a divided oligarchy of “haves” and “have nots”. […]

The US has been democratic for a major part of their existence. There were up and downs, sure, but it was largely a democratic system. So have many other big capitalistic countries by the way.

Russia, while being capitalist, is an authoritarian system - I'm pretty sure that would've also happened if they were communist. But the oil money they got from the west probably tasted too good.

but in the end capitalism is a failed ideology that will never work on a large scale without completely surpressing the market and brutally regulating any sign of market dominance of a few corporations.

Uuuuh, did you use AI to write this? Because it makes no sense. Personally, I wouldn't mind some regulations. Not sure what your point is here.