Violence does not always mean death or scars. The behaviour and views may be violent and even if charcaters don't kill each other, the show still can be evil and violent. It depends on how they will make this death. We may not notice it or it won't upset us. Violence is a wide notion.
But i would like to see Shredder,Hun, TMNT and Foot soldiers safe and sound. When children see that evil guys can be killed, they can think that killing a bad guy is not a crime. That is why they should NOT show any death.
