If you are a pediatric oncologist (someone curing kids of cancer) then you are in a position to have access to many children. If you are also a pedo, then you are also sexually assaulting a subset of them, which makes the difference between the subset and the whole set of zero importance.

If this is too puzzling for you, Larry Nassar has a lot of time on his hands these days, and might be willing to tell you about how he sees the difference between the underage gymnasts he simply coached in contrast to the smaller subset of underage gymnasts he coached AND sexually assaulted.