Umm.. Because he’s nuts doesn’t cover it, you don’t set up all those elaborate traps, have a mass storage of weapons, have a system for clearing out the town, finding food and so on and then claim “Because he’s nuts”.
If he is that nuts he would just eat a gun.
I don't think all people above a certain level of insanity will automatically commit suicide. If they did, the world would be a much simpler place.
Just think of him as "crazy like a fox". Dahmer- or Ridgeway-level insane.
The house Morgan and Duane was in was not theirs
I thought it was. If it wasn't, I sure don't have an explanation for the doorknob thing, but then I also don't know why the wife-zombie was followng him around.