This is becoming ridiculous.
One does not solve problems by tearing out one's hair and jumping up and down shouting, "Stop! Stop! Stop!" That accomplishes exactly nothing and is likely to distract from putting in the effort to understand the problem fully to make it possible to find effective solutions. What is needed is cool-headed thinking rather than useless emotion. Then, the problem can be more effectively addressed and stopped.
There is a precedent from China. For centuries, women had their feet bound. To understand how horrible the practice was, one has to understand what the procedure was. A young girl's feet would be broken so that the forward part of the foot would be folded under, making the feet appear small and, to twisted minds, beautiful and dainty. Women with bound feet experienced no end of trouble with them. There was constant pain and the only way they could walk was to balance on their heals (try it to see how awkward it is); even then, they could not walk very far. It was impossible to wash the feet properly, so they always stank and there was a constant risk of infection. Parents had it done to their daughters to increase the likelihood that the daughters would have a good marriage. The practice gradually faded out as those objecting to it got men to agree never to marry a woman with bound feet. The communists finally put an end to the practice.
The most effective way to end FGM may not be to make it illegal, although that should also be done. Getting men to agree not to marry women who have been mutilated would go a long way to ending the practice, and that may be the most effective way to do it. But again, tearing out one's hair and screaming "Stop! Stop! Stop!" is unlikely to be effective.
During the Middle Ages, there were professional beggars; the profession was inherited, like other professions. To enhance the ability of their children to beg, beggars would intentionally cripple them. Until past the middle 1800's, in Italy, some parents had their boys castrated while young hoping that that would enable them to earn a good living by singing. That was successful for only a very few of them; the rest had their lives damaged with no compensating benefits.
So mutilating children is nothing new and it has always been despicable. But it is senseless to insist that people who are not exceedingly emotional about it are heartless. There are many evils in the world. We should work to end them as effectively as possible and not be obsessed with the emotional state of those who recognize evil as evil. In any case it is inappropriate to tell others what emotions they should experience.