Authoritarianism will reliably produce such outcomes regardless of the economic system or ideology at play, and violent revolution/vanguardism will reliably produce authoritarianism.
Vanguardism and violent revolution are a failure, that doesn't make capitalism the only alternative. Indeed, that's entirely orthogonal.
Plenty of capitalist states have committed similar atrocities. An obvious example being the early United States - the transatlantic slave trade and the various death marches inflicted on Native Americans are every bit as horrifying as the crimes of the USSR, and were committed explicitly to obtain labor and real estate (notice these are both forms of capital) for our burgeoning capitalist economic system. Yet the people who claim the USSR proves communism is necessarily violent don't seem to take this as evidence that democracy or capitalism are similarly irredeemable.
Vanguardism and violent revolution are a failure, that doesn't make capitalism the only alternative. Indeed, that's entirely orthogonal.
Plenty of capitalist states have committed similar atrocities. An obvious example being the early United States - the transatlantic slave trade and the various death marches inflicted on Native Americans are every bit as horrifying as the crimes of the USSR, and were committed explicitly to obtain labor and real estate (notice these are both forms of capital) for our burgeoning capitalist economic system. Yet the people who claim the USSR proves communism is necessarily violent don't seem to take this as evidence that democracy or capitalism are similarly irredeemable.