Don't shoot a pedo in the head.

Shoot him in the cock with a hollow-point.

He won't be able to molest any more kids. He will pee out of a bag for the rest of his life. He'll be alone until he dies, and he'll be in pain the entire time, probably in prison. After he's suffered for years, he can die alone, hated, and writhing in agony.

A head shot is too quick.