Why was Sheriff Thomas McAllister even on the list in the first place?

Remember, in The Red Barn episode, Patrick told Lisbon something like "400 people on the list are people I never ever saw or heard from again, which means they're not Red John"

Sheriff McAllister was one of them! After season 1 episode 2 we never saw him again. Or did we and I missed it?

Anyway, McAllister being Red John is the worst thing that could happen to the series and I think Bruno Heller signed his series death warrant in episode 8.