>He goes way too far though. Especially if he actually wants change, the way he "protests" is directly damaging his own cause, since nobody is going to sympathise with harrassing children.

I don't think this is a given. Just Stop Oil says that their tactics do make people hate them, but their research tells them that it still makes peoples opinions on the issues move in the direction that they want them to. Their position is that if they achieve what they want while gathering animosity towards their organisation, once achieved, they can disband.