First, you're a douche.

Second, you can't read.

I said it's not a viable battle role. He can of course do what he wants. But once the leadership of battle saw or learned he would never kill an entire group of mages, they should have uninducted him. He would still be fully able to go pk all the evil and neutral mages he wants. Just not as a member of the battle cabal.

You can't be a magic hating battle rager, member of the cabal, but say you won't kill a group of mages. You just can't.

Again, that's not to say there should be no difference between killing a good mage and a non-good mage. You (and I have done this with my good aligned ragers) need to roleplay consequences, sorrow, remiss, actions as a result, whatever you come up with. But you can't refuse to kill the mages.