Just to be clear I disagree basically 100% with Nevri about pedophilia stuff. Even the most well-intentioned adult-child relationship runs the risk of trauma and putting the child through a lot of things they aren't emotionally ready for. Relationships can be rocky and messy and hard, regardless of who is in them. There's a difference of power to consider as well, not just physical, but kids are raised to listen to adults. Even if you didn't deliberately coerce the child, you'd have a lot more control over the relationship. That's just a fact.
All this amounts to that any relationship between an adult and a child is basically the adult deciding it's worth the risk of the child having to go through all this, because the adult wants that relationship. It's extremely selfish. This is even if there's no sex in the relationship. Even if the child might want that relationship too, hypothetically speaking, they're less emotionally equipped to make that decision and to handle any problems that might arise.
I also believe media can affect us without it being the fault of bad parenting. Propaganda works for a reason. Military working with Hollywood has also been very successful at increasing military enlisting in the past. A big part of it is personal biases everyone has, so media that contradicts your personal biases may not affect you much, but media might push you further along a trajectory you're already on. It's complicated.
I'm not saying loli makes you into a pedophile obviously. I'm not saying GTA or DOOM make you violent. More like, "Military shooters likely influence how people perceive the military" or "Stuff like 24 likely influenced people to be more okay with government torturing people." Not everyone, but people who were susceptible to those messages cuz they fit their existing biases.