video ;
A ) Not wanting to hurt other people is wholly unnatural for a vampire.
B ) All you have to do is give him a few drops of human blood and he turns into a head-ripping murder machine. If it was really about not hurting other people, he'd learn how to drink without turning into Jack the Ripper.
[He loves his brother, he really does. And it's been awhile since they've fought about Stefan's determination to abstain entirely instead of learning some goddamn self-control. But it's something that still pisses Damon off when he decides to waste time thinking about it.]