The proliferation and widespread distribution of porn via the internet and the subsequent mass sexual desensitization has objective and recognizable downsides on the mental wellbeing of a large portion of the US, especially minors.
The idea that pornography is completely harmless is fucking retarded and 20 years out of date. If it was just teenagers sneaking a playboy out of their dads dresser once in a while it'd be a different story, but after the internet there's fuckin... sissy hypno tranny rape incest gangbang furry scatplay vore plastered all over a hundered-thousand different sites that anyone can access instantly.
It's gotten so bad that younger people, the ones who have historically been the absolute horniest, are actively deriding porn and overt sexualization. It's become so common that teenagers are sick of it. I think that says a lot.