While it's admirable that a hospital wants locals to keep track of youngsters and monitor their online viewing, the idea that online pr0n incites violence has been completely debunked by one study after the next. Data from other countries where online pr0n is even more prevalent and/or recently legalized also disputes this assertion. Here's a very basic challenge to the "causation" premise with more info and study in the link . . .
Psych Today: "If the anti-porn activists are correct, if porn actually contributes to rape, then starting around 1999 as the Internet made it much more easily available, the rate of sexual assault should have increased. So what happened? According to the Justice Department’s authoritative National Crime Victimization Survey, since 1995, the U.S. sexual assault rate has FALLEN 44 percent."
Now the emotional plea that provides good advice but doesn't offer any academic peer-reviewed work to support an unsubstantiated premise:
Experts at Children's Mercy Hospital say pornography may be to blame for a disturbing increase in child sexual assaults.