And to take it one step further...
It even increases the odds of actual children being sexually abused.
Yes, you heard me.
Increases.
There's this little psychological phenomena referred to as Catharsis. Now, catharsis has occupied many theories over the years, and I'll mention the other big ones in passing to avoid confusion.
Aristotle held it as a belief that by experiencing negative events in fiction, people would be more emotionally able to handle it in real life. And... well, all pertinent data I've observed suggests he was on to something.
Psychoanalytical theory, it was believed that people could relieve stress by acting out violently while alone, in order to 'take the edge off' as it were. Screaming in an empty room, hitting a punching bag, whatever. This version of catharsis... sometimes works. Sometimes.
Modern catharsis reads as 'when you indulge a fantasy, you lower your desire to pursue the reality'. Note, and it needs to be understood, that the word 'reduce' does not mean 'eliminate'. There will always be people for whom fantasy is not enough. And there will always be those who don't even experience the fantasy in the first place.
As with all things human, it exists on a spectrum. Add 'reduces, does not eliminate' at the end of every paragraph if it helps you remember.
Now, more often than not, modern catharsis it is treated as the enemy in behavioral science, not an ally. New Years resolutions being perhaps the most frustrating variant. It runs something like this:
Step 1: Want to lose weight. Step 2: Resolve to lose weight. Step 3: fantasize about looking good for the beach. Step 4: Happy fantasy releases happy brain juice. Step 5: Contentment reduces desire, and with it motivation. Step 6: Don't put effort into actually losing weight. Step 7: Go to 1.
The entire multibillion dollar self-help industry is devoted almost exclusively to this phenomena. Either trying to overcome it by using what tricks exist to break the cycle (usually some variation on "make habits, not resolutions"), or exploiting it for personal gain at the expense of others... most of the experts are doing a bit of both...
And this phenomena very much applies to sex. At this point, internet porn has probably stopped more STD spread than condoms, and absolutely prevented more unplanned pregnancies than every sexual education class of every government on Earth combined.
... It's also led to innumerable individuals who are going to die alone because they'd rather seek out porn and other forms of satisfaction online than have actual relationships.
So. Yeah. It shouldn't be hard to see why the mental health community as a whole treats this type of catharsis as an obstacle to overcome.
It doesn't have to be. We can demonstrate that certain violent crimes dip significantly for a week or two after a particularly violent and widely publicized movie or game gets released. This is of limited utility, since even if you had the resources to put out a new blockbuster every other week for... ever... consumer fatigue would ultimately negate much of the benefit. Returns diminish fast.
But not so where porn is concerned. There lay an industry where fatigue is limited to an individual level, not a social one.
I, for one, am perfectly content with the idea of people who voluntarily create this sort of pornography service those who voluntarily consume this sort of pornography, without any need for government involvement and harming only themselves.
Which obviously means fictitious material only, and quarantined such that those of us who aren't interested can avoid it with trivial ease.
"Do nothing, and less children get molested" seems like something that every decent human being should be very much in favor of. And for that matter every lazy person.