Porn actually lowers the amount of sex crimes in the society. Instead of going outside and performing sex with a real person, people simply stay at home. This is by far the cheapest and easiest solution to the problem.

Without porn, the amount of victims would be significantly higher and the crimes would be having a much worse outcome.

Not many people remember the world before porn, but I do. I vividly remember how rape was a regular crime on the streets of my city. It almost completely disappeared after the invention of the internet and since porn become widely accessible to people.

That's not to do with the porn. But with the trafficking and coercion. Those are separate things, and those are already illegal (hence the convictions).

Most people in porn (and prostitution, for that matter) do the work voluntarily.