If for the sake of argument are to believe biology is the main determinant for women's caring behaviours (which has not been confirmed by research), that would actually support the pro-FGM stance that argues that these practices enhance women's biologically ordained qualities, characteristics and behaviours
in that context, then what FGM is doing is not so much as 'enhancing' a natural tendency, but enforcing a set of codified behaviours, whether or not the individual woman is compelled to express them or not. A naturally, healthy body does not require surgery to function or express itself. I know someone who in her role of community nurse frequently meets women and girls who have suffered/are suffering real physical harm & distress as a result of FGM.
My personal view is that while certain traits & tendencies are sex based: natural expressions of genetic programming/bio-chemistry etc, there is a spectrum of possible expression within each sex. FGM over-rides that and imposes a certain standard of culturally accepted behaviour.