
the USSR was really only successful during it’s period of industrialization, past that they didn’t advance much and really only coasted on oil until that started to crash and basically killed them. Stalin also had some, interesting ideas of leadership.
China is an authoritarian state, has been for a long time, mao was, arguably one of the worst leaders ever. Created a massive famine that killed millions just so he could make a single nuclear bomb.
I’m not particularly familiar with the rest, so i can’t really comment. I guess you could argue that the US has done bad things, but so has basically every super power. It’s not really anything new. The primary thing is that the US still exists, china also does, but they’re also having domestic issues as well.

it’s not an excuse, depending on what it was as well as the fact that things can change, someone may have had a negative view at a certain point, but that can change. Unless of course doing a single bad action is always constituted as a negative thing, which doesn’t seem beneficial for society to me.
fascist governments are opportunistic by design, and liberal democracies don’t necessarily have native defenses against them, it’s one of the biggest challenges in a democracy.
if you operate on your definition of neoliberalism sure, but i’m not a neoliberal. The irony could be that these problems are inherent to any capitalist society, arguably any society ever, because inflation is a bitch. The only trivial way to work against it is population increase, in which the US has stagnated heavily.
yeah, and a lot of the existing left leaning governments are based on liberalism, even china to some degree has a significant amount of liberalism. It’s just that they’re mostly authoritarian. You can implement leftist ideologies in a liberal government. It’s not hard or even impossible. Most of these places are already using some form of liberal government, that or authoritarian, which is less popular.