Oof. That's a tough read, thanks for pointing me at that. I think it's worth distinguishing these, though -- CDC data in the US says this is largely an immigrant community thing with immigrants from FGM countries. I do not believe US policy makers and thought leaders think FGM is a good thing in the US - we're all sort of aligned internally, even if it is still a thing that happens. By contrast, the source countries practice it in the belief that it's a good thing for women. (With complaints on stereotypes and summarization acknowledged)
They did not, but you are absolutely correct that it's very widespread with boys here in the US, and the varying reactions to those two things are a good point about social norms for sure.