Think of it this way:
If you were to take a knife to a child under any other circumstances and perform un-needed surgery they would be right to lock you up for a real long time.
Why does society allow the mutilation of infants ?

I am certain that if you left a guy alone but informed him, then at 16 you asked him "Hey dude how about you get a piece of your dick removed?" The answer would be the same in 99% of men.

STAY THE FUCK AWAY FROM MY DICK MAN!!!