I see. Since the suffering of others does not register with you, you must believe that any "bleeding heart liberal" really has some other motive. Well, no. Most (I hope, but at least some) people are really disturbed by the suffering of others.
I take the "normalization" argument seriously. But I note that it is not given much credence in other contexts; violent media, games, ... Perhaps the "gateway drug" argument is the closest parallel.
In the very least, it drives pedophiles underground where they cannot be reached by digital streetworkers, who might help them not to cause harm. Instead, they form clandestine communities that are already criminal. I doubt that makes any child safer. But it's not about children suffering for you, so whatever.