Why do we kill people?

Rules should apply to everyone and always! Yes? Apparently not. Most people can't get away with stealing 100 dollars. Yet others easily get away with stealing millions. It's illegal to kill an other person. Let alone if that person is unarmed and severely wounded. Unless the one pulling the trigger is an Israeli soldier (click) and the victim is a Palestinian who minutes before stabbed an Israeli soldier. Right?

But if we kill other people to show other people that killing people is wrong, what values are we defending?

It clearly was not a case of self defense. The shooter consciously took the decision to aim and fire, planting a bullet in the head of an already taken down enemy. Most judges would judge that to be cold blooded murder. Here's a link to the filmed incident (please do not watch if you can't stand people getting killed):
http://news.sky.com/story/israeli-soldier-convicted-of-killing-wounded-palestinian-10717632

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