I like that we have a police and I've never committed a crime, but having a police around still makes me nervous since they have a lot of power. CoC's have the same effect, any reasonable person would understand this. They make contributing to a project feel more like a job and less like casual fun, and I don't really see why I would spend my free time doing a job for free.

Ironically I would probably not violate a coc. But I won't ever know because I won't do volunteer work in my free time under such conditions.