I can't rule out that this type of material might be increasing the likelihood of violence acts or sexual abuse for some.
But at the same time I can't rule out that it might actually decrease the likelihood for others.
You can easily find studies with both of these results so it's far from being a certain thing whether the negatives or positives are stronger.
Today we have media which is obsessed about covering the negative to get more viewers. Although it might appear that things are just getting worse and worse, again, we are still living in one of the most peaceful times of human history.
I'm not sure what the experience is in other countries but I'm pretty sure youth violence is less severe now than it was decades ago. My grandfather used to shake his head over the news coverage claiming it was much worse when he was a boy and young boys were already fighting on a level you only see with teens today.