That’s because it’s demonstrably worse than capitalist autocracy. Communism itself isn’t a problem, but it has yet to function properly at a state level; China came the closest, but that was still based on stratification and a ruling elite. And now it has the worst of capitalism as well.
We already live in a nightmare capitalist autocracy and people still fearmonger about the USSR.
That’s because it’s demonstrably worse than capitalist autocracy. Communism itself isn’t a problem, but it has yet to function properly at a state level; China came the closest, but that was still based on stratification and a ruling elite. And now it has the worst of capitalism as well.