Just follow this simple rule:

"You can't help someone who doesn't want to help themselves"

If someone doesn't ask for your help, leave him be.

Let him stay "bad" as you would call it.

Chances of you ever seeing that person again are close to 0.

I can't stress how much easier this is to do now that Blacklist also blocks players from joining your PFs.

Word spreads, and people who cause wipes with bad attitudes will end up on alot of black lists.

Sooner or later, they'll either end up with a character that can't do any content through the PF or start a new character.

So I do agree with those who say "It's their money, let them play how they want" because in the long run, the ones it affect the most are themselves.