I do think internet porn is damaging to people in ways we don't yet quite understand
I definitely agree with this. I think people have too blase and naive a view of pornography and the effect it has on people, especially on children and teenagers. Internet pornography and the huge and instant access to video pornography especially is an entirely new and unprecedented thing, and I'd be surprised if there aren't at least some harmful psychological, social, etc. aspects to it.
I still wouldn't call pornography immoral though.