In his defence about the rat torture, he did apparently look ashamed after. Lawrence got a head injury, probably a traumatic brain injury. Those things are nasty and can changes in personality, mess with mood regulation causing aggression as well as memory issues. On top of the trauma of seeing a guy he just befriended die from his own allies attack i'm not surprised something went wrong with Lawrences head. Poor guy. Even seemed upset at becoming 106 to a degree. At least 106 has fun with what he is now in the present

haha i definitely agree with that, i just didn't want to full-on say "look at silly old grandpa man!!" without acknowledging the other things that are-not-so-silly-and-actually-rather-disturbing-and-he-is-an-anomaly