Well, the ones for whom "it" "works" care, because if it's not true, it's useless.
Then there are the ones in power, who care very much, and want it NOT to be true.
I don't care if it's true, and I don't really care about the convicts going to [insert afterlife punishment here] if it's not. I care about them committing crimes again, and if this works then by all means keep doing it.