I'm gonna say he won't blame himself, his mission is killing monsters, not protecting people. if they are around and he can protect them, he will. but that's not the purpose, it's to kill whatever is a threat. however, his becoming a werewolf thing is absolutely going to become a "problem" to him and means your prolly right about him becoming grumpier than Logan lol.
I also wonder how this will turn out, Caleb was able to remember his entire time as a werewolf so I wonder what memories he will have? will he remember the times he attacked people and be furious with himself for becoming the monster he hunts, or remember the... activities he partook in with the Alpha? plus how is he gonna react to being a permanent member of the Bareshade pack? specifically because he literally won't be able to turn back to human since he was a werewolf WAY longer than Caleb was, meaning it should be the same case for him. plus where he will stay feels a little obvious, Caleb is being treated like a resident because of us, we can do the same for him! and he will stay with his wi- friend Rose!