There is still an inherent negative aspect to the "Don't Fuck with Cats" doxxing. Vigilantes publicly revealing the identity of (suspected) perpetrators can enable further vigilante action, and this can cause harm to innocent people if the identification was incorrect, or unwittingly impede law enforcement. And that's before considering whether vigilantism is inherently good or bad.

See the canonical example of this going wrong: the Reddit 'investigation' of the Boston Bomber, where someone was misidentified, doxxed, and their family was harassed.

Of course, law enforcement is capable of making the same mistakes. But ideally they have better safeguards, and victims of their negligence have much better recourse.

> that seems like the exact same usage as here: tying a pseudonym to an IRL for purposes of law enforcement.

I disagree. Tying a pseudonym to an IRL persona for purposes of law enforcement is a part of an official investigation.

Doxxing is specifically non-government unmasking and dissemination of that tie for extrajudicial purposes, almost always for harassment. There is a world of difference between them and we should not fudge them together with terminology. My 2c.

Doxxing a hostile act.

If it's negative depends on if you think they deserve the hostility.