I think changing the wording from “capitalism is violence” (or harm). “To capitalism enables violence” resolves the wiggle room in the argument.
Probably, but personally I think the violence/harm would happen (and does happen) regardless of capitalism/communism/feudalism/Marxism/anarchy/barter economy/etc.
Saying that the violence/harm happens because of capitalism is like saying that rain happens because there are clouds in the sky. There’s concurrence, but neither is the cause of the other, they are both the products of underlying meteorological conditions.
You are attacking a strawman.
Some societies are violent more so than others.
A social system is not simplistically the cause of all violence, and neither is any violence due to causes simplistically detached from the social system in which it occurs.
Violence is latent in capitalism.
It produces massive disparities in wealth and privilege that could not for very long be sustained except by the constant threat of force against those who are deprived, marginalized, and otherwise disadvantaged.