http://www.sciencedaily.com/releases/2012/04/120424095946.htm
Very interesting study and implications regarding the negative affect that exposure to violence has on the very DNA of children. If I'm reading this properly, and the implications turn out to be accurate, this seems to connect causing violence to loss of life at the genetic level. As I understand it, this is consistent with relatively recent implications in the field of epigenetics as well.