You do know, that communism and authoritarianism are two completely different things? Communism by itself is neither authoriatarian, or democratic. A communist world aims at dissolving all borders to achieve global equality without any form of higher governance. This of course is something thats quite unlikely to ever happen. A totalitarian regieme is directly contradictary to the pure idea of communism, which is that everyone should have the freedom to support (or not support) society. Any form of violence (no matter what type of violence) to force people into a set system is therefore contradictory to these ideas. Just because we didnt see very good examples of communism (maybe cuba, but I dont know that much about it, so I cant really judge) this doesnt mean, that communism itself is an inherently dysunctional and bad system.

Also, we have seen much more violence being emitted from capitalistic states, even if they claim to care about human rights. Every year the EU pays quite a significant amount of money to Lybia, so that their coast guard stops refugees crossing the mediterranian sea, causing hundreds of deaths and trapping those who get “rescued” by the coast guard in a subhuman system, where rape and torture are normalised.

This does not mean to invalidate the harm done by self proclaimed communist regiemes, but to show that shitty practices are done by all kinds of different people.