As a recovering porn addict that had issues with socializing with the opposite sex growing up... I don't think there's enough evidence to scientifically conclude anything either way.
As for me, I sought out a large amount of porn "too early". The porn was not violent and I was ashamed to talk about it with anyone. Then again this was before social media became mainstream. I wanted to talk to girls my age but had too much anxiety and depression from my upbringing. ..the real reason for my addiction. So I got called a teenage stalker and got punished so hard I stopped talking to women entirely. The porn was because I was so depressed in the following years. Nobody even realized I had a porn addiction to this day, because I didn't talk about it because... it was cringe.
Still a bachelor but I go to meetings and have worked on it for several years by now. When I worked on my issues enough the urges went away. To the point I wondered why this was such an issue for so long. I no longer feel the need to find a mate to feel complete anymore. Which ironically would make talking to women possible again. But that wasn't because of porn - it was because of depression/anxiety.
I ascribed the causes incorrectly for a long time ("excess porn usage causes the tendency to sexually harass/assault people you're attracted to") which only contributed to my shame and depression for a long time. I think it's because people don't want to admit that they cannot help every person with major depressive disorder ("you need to want help to get help"), so they go after bigger fish that are open to litigation to make it seem like the problem is being addressed. And all this labeling of porn as a problem rubs off onto actual addicts who misjudge the real root of their issues like me.
I have a hypothesis that telling teenagers their minds will be permanently corrupted by too much pornography of any kind and they should be ashamed of themselves for having sexual urges is... not exactly the most productive decision. Especially when gore videos remain unregulated and legal. I think depression/anxiety has a greater chance to cause the behavior they're talking about - "hurt people hurt people" - and those people just so happen to be addicted to something to self-medicate. Shaming people is certainly one way to make them depressed.
But I was sorta glad I avoided talking to people I was attracted to for so long, in my depressed state not much good would have happened. I now have a healthier appreciation of the other sex without completely abstaining and in my view it had nothing do with porn. It was actually about seeing and accepting reality for what it is, not through a depressed filter.
