@Glennn,
There is no such thing as an innate objection.
You object to ritual cutting of the clitoris because you were trained to object to it. You have spent your entire life in a Western culture, Every influence has taught you to see things from a Western perspective from your parents, to school, to your peers.
That is the basic problem. You can only see thing from your own cultural perspective and this is why you assume that it is "innate".
You get your "common sense of decency" from your culture. And if you were brought up as a pre-colonial Aztec... your ideas of what is "barbaric" and "decent" then the ones you have now.
Like it or not, you are a product of a specific culture with a specific set of beliefs and values. There is no objective reason to think that your perspective is superior or "innate" or "common".
Different cultures have vastly different ideas about what is barbaric or not barbaric. Your use of terms like "common sense of decency" and "innate objection" implies that your culture somehow is more true than any other culture.