Of course, some reasonable people think that genital mutilation is OK, because being reasonable does not guarantee moral clarity. This is why many reasonable people supported slavery and other abhorrent things.

I can't believe anyone would allow someone to knife off part of their child's genitals (even with anesthesia).

Maybe if the procedure involved branding the Playboy logo into the genitalia (with anesthesia) it would be easier for people to see how barbarous it is.