Aside from the fact that no one was let in peace so they could implement communism and all the countries which tried to go for communism were forced to stay in a State Capitalist + Social Welfare format, keep militarizing and stay in a state of pending war to defend themselves, one could easily say that capitalism did kill more, and is still killing countless millions of people all around the world - even we take the countries/systems you are mistakenly calling communist, as communists.

I'll illustrate with a very blunt example:

People who died due to famine in Holodomor are counted as 'kille...