Hey Tommi!
You were just being a human, you see, only humans are able to kill each other, lie to each other, steal, cheat...as you can see, its in our nature, its ingrained in us, that primitive, savage and cruel side..
Only a few humans can actually evolve and tie their demons, or better yet, learn to live with them...but, that my friend takes a LOT of time, and willingness and a LOt of patience..
Good luck!