For the most part, Catholics, both communist and otherwise, believe in the right of self-defense. Capital is not pacifist. It spends billions to protect the wealth which it steals. Self-defense against the oppressor's murder and theft is nothing new. The struggle against oppression and exploitation constitutes the main substance of human history.
Capital lives by the sword.
There is hatred by capital against the working class. Communism does not teach hatred, but teaches how to defend against it. It's a question not of preaching class hatred but of explaining a social reality, something that has occurred throughout history. The class hatred of capital and of its servants in the church hierarchy becomes passionate against revolutionaries. In the life of great revolutionaries the oppressor classes subject them to constant persecution, hear their doctrine with the most savage rage, with the most furious hatred, with the most immoral campaign of lies and calumnies.