Of course. For example, when you say that "China killed 1-5-10-50 millions of its own citizens" you must consider the scale of a country when even one mistake in politics or economy can cause so many deaths.
What I'm trying to point out is that only totalitarian regimes can kill millions with a "mistake in politics or economy". That doesn't happen in free market countries because the entire populace doesn't have to take stupid instructions, and is free to travel away from famine.
USA get a lot of bad response because of double standards policy. It was the same with British Empire. You can’t take two violations of international law and say one is acceptable because its “good” or lead to “better consiquences” (how the hell anyone can confirm that?). For example invasion of Iraq is “prepearing Iraq people for democracy and independence” while same invasion of Afghanistan by USSR is an “act of aggression and occupation”. Kosovars and Chechens are “freedom fighters fighting tyranny to protect themselves” while Ossetians, Abkhazians or ethnic Russian separatists are “mindless criminals, brutes and enemies of free world”. You can’t advocate Kosovo and at the same time condemn South Osetia or Donetsk as a direct violation of international law. That’s hypocrisy and double standards.
For the most part, I agree with you. But we do get back to the equivocation problem - the US has a history of setting its occupied former enemies free as sovereign states, and other countries (like the USSR) just keep occupying them. So when autocratic Russia is "helping" the "rebels" in neighboring Ukraine (which has a lot of ethnic Russian citizens), it doesn't look much like freedom anything is happening, because a not-so-free country is attempting to make a neighboring country subordinate to it. The methods and excuses all sound the same, but the expectations are different because of both the history and temperament of the states involved.
You just can't claim to be "setting a country free" like Afghanistan or Tibet if you have absolutely no stated interest in those countries ever returning to self government and your own state is against representative government.
In the modern internet, post Communist age, the US has no interest in setting up puppet dictators to fend off Communist expansion - dictatorships aren't stable in the information age. Free market representative governments are the most stable, because they are mired in the bureaucracy of democracy - you can't have a revolution when everyone is already part of the process.
Another thing is – Americans do not understand or care about how sensitive some political or national topic can be in Europe or Asia. For example let’s take a random quote of yours: “Russia killed 20 ml. Soviet people”. The quote itself is absurd because there was no Russia during USSR era. Soviet government was a mixed bag of all nations that lived in USSR: Russians, Ukrainians, Georgians, Tatars and other. By claiming that “Russia invented communism and killed millions in former USSR countries” you provoke national conflict, hatred, historical vandalism. This is what is now happening in Ukraine.
No one in foreign lands is promoting internal descent among the former Soviet states by speaking casually about the old power structures. The Soviet revolution started with a country called "Soviet Russia", which then entered into a union with several other states and invaded several others to form the USSR, which was run out of the Russia, used Russia as the defacto national language, was culturally dominated by Russia and was composed of just over 50% ethnic Russians. After the breakup of the USSR, Russia is the one sitting on the UN security council and Russia has the most power and influence. So I don't buy your melting pot argument - the Soviet Union and Eastern Bloc were controlled by a Russian power structure and Russian dominance that still exists. So when the west observes something about "Russians", it isn't some racial thing - it is the observation that Russian citizens have always had the most clout in the region.
Another thing is American support for some regimes because those regimes are supposedly champions of democracy. I will again give you example of Ukraine since I live here. USA support Porochenko who is much worse than any of our previous president. He is corrupted, mean and oppressive. He assassinates his political enemies and journalist and use neo-Nazi youth to silence anyone who talks bad about him. People are living in terror and afraid to criticize him in any way. He is hated by both pro-Russian part of population and Ukrainian nationalists. Literally nothing good happened during his reign, people hate his guts. Buy every time you switch to American or British media they are telling us that Porochenko maybe is not a perfect choice but still a friend of democracy. And by supporting him “USA is preparing Ukraine for democracy and independence”.
Then you should get a different president. We currently have a bad president, and we will rid ourselves of him in 4 years. But even Trump does not have the power to assassinate or form a Hitler youth. No US leader has powers to behave that way. If you have such a leader, it is not our fault, whether we "support" him or not. We are just supporting the democratically elected leader of a sovereign country against another country that is trying to screw with that sovereignty. If your people are not able to sue bad policemen in court or hold an election, you aren't living in a democracy. And you aren't ever going to end up in a democracy when the neighboring despot is supply rebels with arms.
What I see in a lot of post-Soviet politics are people either acting like Soviets, or acting like ethnic pre-Soviet enemies. When countries protect the rights of individuals with the power of law and elections, they don't need outside countries to "help them" run their countries or supply their revolutionaries. But many former Soviet countries had never been free in any way, and still have no idea what that actually means.
That said, I completely understand that your country is struggling and our simple sounding pronouncements about who is right and who is wrong are frustrating. But I think you have to understand that the West can't care too much about that. We will generally support your right to be free of Russia to make your own government so you don't end up as Russian puppets, but that means you have to do the hard work of making your country work internally.