Since Connor was changed and not born into the pack, I think it skews his view on things. He's still a little too human for his own good. To him, it's about a friend being murdered, so it would definitely be on a personal level. In time he may learn to understand Nick's motives but I don't know how much that will change the way he feels toward him. Not to make Connor sound crazy or blood-thirsy, I don't think he's going to go all out trying to murder the guy. But given the chance, he'd want to avenge his friend. To make things even more complicated, he was courting Charlotte at the time everything happened.