It's not a particular case. It's the standard practice of the cult that these people were in. That "particular case" happens to be the leader of their cult. These men groom little girls to be their brides and often times are screwing around with them when they're underage. You were comparing grooming a woman to be your sex slave as the same thing as choosing religious attire as an expression of your faith. I don't see how they're comparable at all.
It's all sexual fetishes - the niqab and the burka included.