Do you live there? If not, then you only know what information is fed to the public. The thing is, the information we have, is curated to appear better than it actually is.

1. US police kill around a thousand people who arent in prison every year. The US contains 25 percent of the world's prisoners despite only making up 4 percent of the world's population.

2. By “succeed” you mean the 1000s of countrymen and women that were slaughtered to silence by the tyrannical leaders’ armies because they were an actual threat to their grip on the people.

2A) lots of those people were right wing or fascist assholes who should be repressed.

2B) This is what every state does, capitalist or socialist. Socialist societies aren't yet communist so they don't get rid of the excesses of the state, they only get rid of the violence of capitalism.

3. The US cuban regime was a horribly violent dictatorship. Now, Cuba has a thriving democracy which just overwhelmingly passed a family code by referendum that makes it the most progressive country in the world on lgbt and family rights. Before it was voted on, it was developed starting on the local level and where each citizen had input on the process and then moved up into larger committees.

The US was responsible for four million vietnamese deaths by waging their illegal war there. Vietnam is now a flourishing democracy despite still cleaning up unexploded ordnance and chemical weapon contamination. The vietnamese people have a strong anarchist tradition and decentralized community armories to resist aggression. Every citizen is trained in basic warfare and college students are required to study more advanced military knowledge. If they didn't want their government, their government wouldnt be around for long.

Laos was bombed to shit by the US despite never being party to war. Laos is currently a one party socialist democracy that is doing well for itself and well for its people.

The US killed 20 percent of the Korean population after the dprk tried to liberate the south, which had become a US puppet military dictatorship that was killing thousands of peaceful protestors and tens of thousands total, including random people and justifiably violent protestors. The DPRK has more democratic institutions than modern South Korea. South Korea's military is still subordinate to the US pacific command.

The socialist Chinese government has stronger democratic institutions than the US. Over a hundred million people are members of the party. The Chinese people overwhelmingly approve of the party: https://news.harvard.edu/gazette/story/2020/07/long-term-survey-reveals-chinese-government-satisfaction/#:~:text=The%20survey%20team%20found%20that,%E2%80%9Chighly%20satisfied%E2%80%9D%20with%20Beijing. Which makes sense, given that China has gone from an impoverished semi-feudal country to a modern nation massively improving the quality of life of everyone within it, all while breaking the US stranglehold on the world by merely being an economic alternative.