Not to mention him shooting a random guy in the head with a crossbow just to see how it worked! 
I didnt like that part. the rest of his killing might have been assholes anway since the mafia wanted them dead. And I assume they dont want you dead if you havent done something bad. (what do I know though)
it also sucks that he promised his mother that he wouldnt kill his father. Imagine what he would have done to him.
