People tend to worry about the evils they know or have experienced in their recent past, just as you do. And the US alone has ~300k people per year dying of lack of healthcare (not including heart disease!), and millions sentenced to slave gulags for trivial offenses where their labor is monetized for the personal profit of brutal oligarchs - the largest concentration of slave labor in the world, by a massive factor. And there are just as many famines and other deaths as well - the distortion of crop subsidies on the food export market has repeatedly caused exactly such famines, and that's all a completely capitalistic phenomenon.
https://www.bmj.com/content/bmj/327/7424/1129.full.pdf
People under capitalist rule tend not to think of it as such, but those are the victims of capitalism, just like the holodomor is victims of communism. And that's not "tu quoque" but rather simply applying the same standards and method of analysis to both systems.
That's why people keep diving into that, it's not that communism was so great, it's that capitalism is the particular set of horrors that they're currently living through, so people tend not to be thrilled about that. They are as entitled to their past experiences and history as you are to yours.
Anyway, it's weird, because we all love these organizations called "corporations" that use exactly the kinds of central planning that is supposedly impossible to execute properly. Companies that treat divisions like a "free market" and force them to compete for resources and attention generally find this works extremely poorly, you actually need collective coordination and human benevolence/good-faith for anything to work. The part about capitalism that's nice (on paper) is that it breaks the collectivism down to a scale that humans can plan and function with, and forces active competition between entities such that inefficiency is pushed out of the market (although of course there is an inherent tendency towards oligoply and consolidation without government intervention).
But the thing is countries cannot work like this, and there is no guarantee that a capitalist country doesn't suffer the same "complacency capture" as an oligopolistic market competitor. Nor is there any failure mechanism to replace them when this happens, short of outright political collapse (which may be impossible due to situational factors anyway). Again, we live in a state with millions of political prisoners being exploited for slave labor for oligarchal profit... that's the failure case for communism too, capitalism is just as capable of falling into the same pitfalls. And success is, as always, completely orthogonal to ethical merit - you can be good-hearted and still fail, or act unethically and succeed (and in fact it helps!).
Again, it's not that communism is so great, but pointing at specific bad outcomes while refusing to apply the same standards to specific bad outcomes from capitalistic systems (while chanting "tu quoque") has always been an aggravating feature of american political commentators. The lack of ability for self-reflection is why we live in a prison state and a police state and increasingly a total-surveillance state, we have horrible outcomes here from our system but "it's better than ukraine 1936!". And that's a pretty low bar, why is that always the focus of the discussion?
And why does it have to be "if you like it so much go there", like the only possible choices in the world are US prison state or china/NK prison states. Why can we not choose to be the EU instead, with a generally socialist outlook and many outright collectivist (worker/state owned) enterprises but also a strong democratic system riding herd over limited and regulated market-economics?