Rewards for honor.
As for now nobody really cares about honor because rewards for that are insufficient. I am actually getting more toxic when I see that for lvl 5 honor I get only 4 key fragments and some stupid BE. Honor 5 should give a lot more, so that it is worth being nice and keeping the positive mentality. Banning people is working really badly, so maybe rewarding them for good behavior would help. I am only saying about Lvl 5. It should be hard to achieve and very rewarding.