MrManager, we have probably all met a paedophile in our lifetimes. We just don't know it. Statistically, they are far more likely to be members of our own family than strangers hanging around the playground waiting to 'take' children.
I work with children in care, a sizeable chunk of whom have been sexually abused. It is therefore something I fear for my own child. I have seen the damage paedophiles do.
I think to dismiss all fear about paedophilia affecting our own children as alarmist is incredibly dangerous. I agree that the balance is often tipped towards hysteria (vandalism on a paediatrician's house, for example), but it is just as irrational to suggest that the balance needs to be tipped as far in the other direction.