“Soviet style communism” quickly became authoritarianism, especially under Stalin. He was communist in title only imo, with a focus on genocide and foolhardily believing that eliminating people with actual education in their fields and replacing them with “the commoners” was somehow good for the country because it looked communist.

> Communist theory may not imply those things

Then just don't mix up the words, I guess? Otherwise you end up saying nonsense like this:

> I have a theory that if you jump of a tall building and wave your hands really hard, you can fly. This theory does not imply you falling to your death. And if you do, it just means you weren't really following my method.

An argument I’ve seen is that we haven’t seen a truly communist country yet. The most promising ones (imo) were smaller countries who’s communist ambitions were stifled by American-backed coups. Many of the earlier communist leaders like Lenin and Mao also knew that their countries weren’t communist in practice, as you can’t slip a switch and suddenly you have working communism. Their goals were to establish governments that could lead their populations to eventually being communism in practice instead of just as an ideal. Obviously, this depends on having a government that is actively trying to make itself obsolete, and most politicians don’t want that.

Capitalism may “work”, but it’s definitely not sustainable without checks and balances and limits on wealth accumulation and influence. Allowed to roam free, it’s disingenuous to say they “aren’t perfect”, they’re destroying the planet and its people.