Why is female circumcision important in the Maa culture?

Resian and Taiyo are uncircumcised, and to the Maa people in the village, it is a symbol of their being outsiders, and culturally alienated from their traditions and their heritage. To the Maa, it is also a symbol of them being in some way bad girls, as they do not conform to the requirements of being dutiful prospective wives.