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1. I think censorship laws are abhorrent
2. It can be very difficult to tell what effect media has on you, and just because you do not (say) find yourself traumatised or find that your perceptions have been overtly altered does not mean you have not been negatively affected. And you will certainly never be unaffected by anything you experience or do. This is something that I've become more sensitive to and aware of as I've gotten older. And further, it is only through this sensitivity and awareness, and acceptance of the fact that I cannot just decide by fiat how things will affect me, that I have gained some measure of control.
How do you know?
I'm not arguing porn is harmful to minors, I have no idea what the data says. But people tend to be terrible at self-diagnosis.
So I will assume you are conjuring facts out of thin air.
Because patients are terrible at self-diagnosis.
As far as I know, there are many scientific studies that disprove what you've said - and that porn has, in fact, a harmful effect on young minds. Of course there are many other harmful things that we nevertheless accept, like alcohol, cars or cigarettes. So maybe we can, as a society, decide that letting kid watch porn is OK and not worth the alternative (privacy intruding regulations). But arguing that it's not harmful at all is not, I believe, scientifically justified.