What about child marriage? Since “there is no judgement mechanism to determine if it was forced.” And should we let people sell their organs, too, since we can’t prove coercion?

Ultimately, you’re right, we can’t make these cults illegal, but we can make the cultist’s lives as difficult as possible. And we should.

Let me put it another way. Anyone who thinks women must wear black bags on their heads is a piece of shit. Since many people will be helped by this law, and only pieces of shit will be inconvenienced, it is a good law.