I don't believe that watching porn promotes assault. It's more a question of opportunity.
No one should ever say never. History shows that with the breakdown of any social order, things get out of control. Of course there will always be individuals who don't become perpetrators, but in a time of impunity, as in war, inhibitions fall. Always. No matter which continent. No matter which side.
... see Yugoslavia ... See Ukraine ... See Abu Ghuraib ... and so on ... and so on ...
I never believed any kind of media was a trigger for crimes. I remember all the times the media here in Brazil started demonizing games due to violence, and even the current president did the same.
There is a single reason why the mainstream media demonizes everything, it's because they lose viewers the more the other media grows, such as games or Twitch streams. I can think of a few situations that happened along the years:
Globo v Japanese Animation(Anime in Brazil)(mid 2000s): Globo is the leading mainstream media in Brazil, kind of like a NPR/CNN, it's majorly state-funded. They tried to demonize the japanese animation, due to a case where a young couple ran away from home. And why they did? Because the young couple was a fan of japanese animation. Globo was and is a DEI-compliant media.
The Pesseghini Murder: The Pesseghini Murder was another case of mainstream media demonizing games. First showed by Record and then by Globo once it picked up steam. In this piece of news, Marcelo Pesseghini, a son of a cop couple, killed his parents and took his own life. Searching through the boy's Facebook, they found several artworks of the game Assassin's Creed and started to claim that the game was a trigger for it. This was promptly shut down by Ubisoft, who released the hounds on Globo and Record, saying that games should never be linked to murder cases.
"There is no game about love"-Lula, 2023: This case, which happened a few months after corrupt president Lula took office, he let out "There is no game about love" during one of his speeches. He used the same old line that games are triggers for violence and, of course, was criticized and became a meme. Happened a few months after he announced an initiative called LulaPlay, which involved games.