You do not know how much you make me want to punch you in the loving richard. How the hell does it stop griefers? If I make a server, and someone asks me to whitelist them, and I accept them, what stops them from griefing? Seriously people, use your loving head.
I never said that whitelisting completely stops greifing, but by whitelisting you can help prevent the people who have already been reported as greifers from getting in to your server, reducing the chances of greifing.
Maybe you should use your head before going off rageposting.