As a White person, given the sad history of White people's subjugation of indigenous African cultures, I have a great deal of humility when it comes to cultural differences. I find it deeply troubling for any White person to declare that a cultural practice from an indigenous culture is "barbaric".
The word "barbaric" has been used historically by a dominant culture to subjugate a weaker culture... including in Africa.
I was born in the US. Since day one I have been taught about American values. I learned right and wrong from my American parents. I went to school and learned American values and an American way of thinking. I was surrounded by kids who were also American with an American world view.
I can not deny the fact that this upbringing dramatically impacts what I believe, my sense of right and wrong and my way of looking at moral issues.
And I also know from listening to and even meeting people from other cultures that human being who were brought up in other cultures have different sets of values and beliefs. And, at times, these cultural differences are drastically different. So here we are with the most extreme case we can find... the cutting off of a girls clitoris. This is an example where Americans (and White people in general) find a practice "barbaric" that African cultures feel is important.
How do we resolve this situation? It seems to me that you are saying "it is wrong because I know it is wrong". You are not accepting the fact that what Americans know is wrong is different from what people in these indigenous African cultures know is wrong. You have not acknowledge the fact that these African women are as intelligent as you. Their beliefs are as heartfelt as yours are. And their opinions about what is best for their daughters are at least as valid as your opinions.
This takes humility. And given what White people have done to Africa, a great deal of humility is owed to the people that we are now condemning.