I've been around a fair number of people who -- what's the word, "consume"? "use"?, porn. I guess it depends to some extent how you define porn.
Playboy?
Women's bodice-ripper fiction?
At any rate, I don't think any of them were inspired to commit violence.
I agree that it's better to not expose yourself to certain types of images.
Personally, I don't watch explicit porn or gratuitously violent films, and that's fine by me, but I don't feel I should stop you as long as it's just fantasy.
I think a sick mind could easily take the next step. They don't lust after the women they see per se. They hate them and want to control them in sadistic ways.
The typical guy that buys Playboy doesn't usually have this mind set. He's just turned on by the pictures.