The best solution would be a sort of ‘democracy in action’ approach where pw and his ilk are simply ignored and shunned in the hope that they will just go away.
It would take willpower and ‘the word’ to spread, but it would be amusing to see every pw post resolutely ignored and if pw ever started a thread it was guaranteed to slip down the pages with one solitary post.
A bit like what probably happens to trolls in real life, thus prompting the need to live vicariously online.