Because some people actually do act like jerks, and we want to be able to tell those people to either stop acting like jerks or go away.
> CoCs were doomed to this from the beginning.
Rather, Codes of Conduct are more difficult than you think. The article itself points to several ways in which the committee in question didn't follow their own guidelines. It also points to "Code of Conduct Best Practices" which aren't followed by the Code of Conduct in question.
> Any set of strict/influential laws should be supported by a proper set of institutions like courts, lawyers, arbitration, judging practice.
This is I think a big problem right now. Our community adopted a Code of Conduct proactively; we haven't yet had to deal with any issues. But I'm painfully aware that doing this sort of policing well takes time, skill, and training, which I don't think it's reasonable for normal community members to take.
On the one hand, I'd love to be able to (for instance) outsource all CoC engagement and enforcement to a specialized body, that could manage a whole investigation / accuser / defense / jury system for a number of different organizations.
On the other hand, there are an awful lot of decisions made that I very much disagree with. For example: