What a strange question! Why is it so important to have a justification to kill? How many who say they would respect the sacred life of their fellow man would fly into a rage and kill their lover they were unfaithful, or take up arms against their brothers to fight a war that would gain them no land and no honor personally? How many eat meat, or use prostitutes, or treat the poor as servants, or support a death penalty, or otherwise find ways to use and exploit and end the lives of other living things? How many would be willing to kill, or pay others to kill, to replace the leadership of this city to replace it with something more to their liking, if only they wouldn't be held accountable? And yet even if they stand to benefit from wars and murder and exploitation, those who do not dirty their hands see themselves as having moral high ground.