Doesn't "kill the dissenters" seem to be the flavor of most communist countries? China, N Korea, Cuba, Cambodia, Romania, Vietnam, etc.
Glad we cleared that up.
[0] https://www.marxists.org/archive/marx/works/1867-c1/ch31.htm and https://www.marxists.org/archive/marx/works/1867-c1/ch26.htm
But even if everything you say is true and capitalism is a sort of slow killer, I would still prefer it to communism, which is efficient only in murdering those it governs.