Hi, I was kind of thinking around this yesterday.
What I was thinking is that some of the contraband stuff represents a real temptation to those who might otherwise only use 'the next best thing'.
The example I had in mind was that of a Paedophile. You see I imagined that a Paedo' with no access to child porn might just use idol pics or some such.
In other words: Without some of the randomly uploaded porn there would be fewer cases of people crossing over from Pervert to Criminal.