Quick Question

I was working on a short story idea, and I came across a question. "What in life is worth killing for?" I asked my brother P.K., who coincidentally is no use when it comes to metaphorical questions, his take. His reply was "Nothing at all." After berating him for being useless(Seriously, he was.), I sent a text to my dad. No more than five minutes later I get this reply: "wife and mother". Accurate, but does not really help me in what I am efforting to do.

So I ask you, well the nine of you who read this, to tell me what do you think is worth killing for?