meh any reason really, but thats just me, and I wouldn't do so without having my tracks covered first which is always alot of work, good thing I'm lazy. And no matter how you slice it ending a fellow human's life is ALWAYS for personal gain, be it self defense, defense of others, food, sex or whatever you stand to gain alot from just the act of doing so, because it gives you an experience of intimacy that very few people could even comprehend, beyond what holloywood shows them. Its really only a big deal if you make it one.