and it’s the government model that is to blame?

Yes, because it leaves itself so prone to authoritarian takeover. As I’ve said before, this is a feature of communism, not a bug. A single, one-party “transitional” government is intended. You might as well just put up a sign that says “Dictator Wanted.” This is why there isn’t a single instance of communism on a nation-state scale that hasn’t quickly devolved into an authoritarian state. It’s not hard to understand this. Your government model has to account for the reality that people are going to disagree on things and faction out. Your model has to be able to manage that process. Communism insists everyone adhere to the same ideology, and those that don’t just get “re-educated.” It’s a horrible ideology, a horrible government model; naïve utopian fantasy at best, cynical authoritarian scheme at worst.