Reminds me of an experiment conducted on some monkeys. They had 5 monkeys in a room, in the middle of the room was a ladder and at the top above the ladder was a bunch of bananas. When they monkeys tried to go and get the bananas they were sprayed with cold water.
Eventually, the 5 monkeys stopped going up the ladder as they didn't want to get sprayed. So, the researchers replaced one of the monkeys with a new monkey, immediately, this monkey tried to climb the ladder, so the other four monkeys beat the new monkey to prevent him climbing the ladder and causing them to be sprayed. Over time all the original 5 monkeys were replaced with replacement monkeys, who had never been sprayed. But when the researchers put a new monkey in with the replacements, the other monkeys would still attack it to prevent it climbing the ladder. DESPITE the replacement monkeys never having been sprayed.
The point was how easy it is to fall into the practice of, "That's just the way things are done round here."
The women do it voluntarily, now. But previously it probably wasn't voluntarily, chances are good they were forced to do it in the past. Therefore, try to educate as to why the practice should be abandoned, if that doesn't work.... Force. As I say, chances are good they were initially forced to do it before it became standard practice. And since I am dead against forced mutilation from this right down to circumcision. I see no crime in forcing the practice of mutilating a human body to stop.
Really cool example with the monkeys.
I think education is the responsible choice.