Well, this left me in a place of terror. Yes, the person tries to rationalize the killing, but it still scares the crap out of me! I’m sure that was the point, though, right? You succeeded.

First line…perfect!

Niiiiiice! For all of us who were picked on in school you did us a solid.

Very nicely written. From the shocking first line to the chilling end: slowly

Great! We know what happens, without you describing it in detail. It also is believable because you’ve showed how that he isn’t a maniac by saying “I don’t go around murdering people all willy-nilly.”
I thoroughly enjoyed it! :)