As a parent of kids that play MMO's, we generally agree that "bad guys"(NPC mobs) get defeated rather than killed.

(You try explaining to a 5 year old why my "superman" just keeled all those guys!)

Would it be possible that bad guys end up in an arrest position, such as kneeling with hands behind back instead of rag dolled into the local scenery? (If they do some ragdolling first, then roll up into position would be cool too.)

Just a thought.
May help with that Rating later on too. :)