If Ra sees this as a voting game, getting into politically charged arguments with newbies and then down voting them is efficient.

They give him a target that lets him post a lot of replies, and with low karma they can't down vote him back.

He can use a second account to vote up 30% of his replies, giving him a good amount of karma at low risk of discovery.

He gets a chance to run off a newbie that doesn't agree with him.

And we all gain from this. We don't need users that can't ignore a troll.