When my parents had my wisdom teeth removed, they were removing functional teeth. In retrospect, I would have to say that they were serving a non-essential function, since the remaining teeth seem to get the job done just as effectively.
I'm still with the "parents should probably just let their boys grow up and decide whether or not they want their foreskin" faction, but I also agree that calling circumcision "mutilation" (except in cases where it's botched and really becomes mutilation) is just over-the-top hysteria.