The Children Act 2004 contains clauses to protect children from harm as, no doubt, the 1998 Act does too. If FGM isn't harm, what is? I think there is seen to be a need to "do something more" and that is why the PMB on this subject was put forward.
But, thinking (sorry, intellectualising; thanks for the compliment) about this, it seems to me that the problem, whereby people have not been prosecuted for engaging in this awful practice, has been what is euphemistically called "cultural sensitivity". Wonky thinking about multiculturalism has meant people feel awkward about calling out what are poor cultural norms, practices we should not tolerate because they are not good. I hope the recent prosecution will help shift that wonky thinking fear.
As for Chope and all the criticism of him, that's just a sideline of virtual signalling: he's such a bad man! tut, tut!
We should thank him for bringing this into the blazing public eye instead of making him a scapegoat for public outrage. Where's the equivalent public outrage about FGM?