Is the problem the tenets of communism? or is the problem the dictators and strongmen who inevitably rise to the top?
or the corruption that grows from unchecked power?
The only reason communism keeps re-emerging is because it takes advantage of people's empathy, promising that it can directly address the needs of the many.
See: their zero covid policy. Great at first, but the stuck dogmatically to it even after omicron, which led to massive deaths.
Most people would reject communism if they had the freedom, so the freedom is one of the first things to go under communist rule.
Communism's "time in the sun" was not really about its ideological merits. It was just something fed to the intellectuals to get them to buy into the Russian/Soviet planetary takeover. It made people believe they were fighting for a cause rather than someone else's petty interest.