It's being surgically altered from it's natural appearance for non medical reasons.
So are pierced ears, fingernail clippings, cutting hair, non-cancerous mole removal, cochlear implants and spinal fusion in some instances.
Let us be very clear. Parents do choose to alter their children's natural state for non-medical reasons. If this were the only criteria in establishing "mutilation" then we will have a mutilation category that borders on ridiculous.
You can paint the surgery as mutilation but at the end of the day it is just an elective surgery that parents choose for their child.
This is a government telling parents what they can and cannot do with their child. This is not necessarily a bad thing. It is about drawing a line when such intrusion is ok.
I think most people will agree such an intrusion is acceptable when a parent is for instance starving their child. I think we also agree that cutting a child's hair is not something that warrants government intrusion. So where is the line?
I understand that calling circumcision "mutilation" allows you to think that circumcision falls on the warrants government intrusion side of the line. But, many people do not equate it to mutilation. While there is a permanent change, many do not consider that permanent change a disfigurement.
That leaves us several options, you can try to convince them it is a disfigurement, you can clearly articulate the issue without calling it mutilation, or you can go on preaching about mutilation because you really do not care to hear other perspectives.