Larry WAS an asshole, even through he was that way to protect his daughter from an "assassin" like Lee or someone who threatened the integrity of his daughter dictatorship with an much more visionary view about how to rule the group like Kenny, he had to accept that he was in the same boat as everyone and stop thinking only about him and his daughter, i mean, being rational here, why would Lee kill him or his daughter when he would depend in the whole group for help? He attempted to kill someone who was helping and supporting the group much more than him (which was a burden in the whole "A New Day" episode and an idiotic, stupid and brute in "Starved for Help") he thought that everything revolved around him and his daughter, as he thinks that every decision that contradicts his interests is an direct attack to him.
Kenny is my all time favorite, i don't think that this is an surprise, BUT, i didn't killed Larry because i wanted to support Kenny, i killed him because first things first:
1- He risked the group with selfish behavior, and was able to do anything if that attends to his interests and his daughter in particular, his attempt to kill Lee was one, his constant bickering against Lee and Kenny affected the group moral, and it doesn't surprise me the fact that EVERYONE on the group, except for Lilly hated his guts, he couldn't think for just ONE moment in the group, if it would hurt just a bit his daughter dictatorship and his stupid pride;
2- It was an silly attempt on try to save him, he simply COULDN'T get off of that, think about it, in minor cases he needed nitroglycerin pills and considering his corporal mass and size, he would need an full-CPR and shock equipment, full-CPR for make him come back and shock equipment for making his heart contract and expand again, making his blood presure come back to normal and getting him up, Lilly was in denial and thought that she could save him only by making cardiac massage and telling herself that he had it worse, comparing an pre-apocalyptical situation with an post-apocalyptical one.
Larry simply denied any social interaction with the group, unless if it was to be an asshole, and he simply couldn't put his trust on anyone, and this goes way far from "protective nature". IM GLAD THAT HE DIED.