A pedophile is someone who's sexually attracted to children. Some pedophiles also rape or molest children. There's nothing much worse than a pedophile.
There are a lot of dangerous and sick types of people in the world, but someone who sexually assaults children — a pedophile — is probably the worst of the worst. People look down on pedophiles more than other dangerous criminals because children are young, small, and vulnerable. Children need to be protected, not preyed upon. Even in prison — a place full of killers, thieves, and rapists — the other bad guys will usually hurt or even kill a pedophile.