Why do some people believe violence is always wrong?

For all violence to be wrong is ridiculous and stupid. When a person uses necessary violence in self defense, it’s always justifiable. Anybody that disagrees needs to be charged with attempted murder. I won’t argue that violence is the last resort. Pacifism is useless. People that believe all violence is wrong lives in a magical fairy world which is a world that doesn’t exist.
Why do some people believe violence is always wrong?
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