The biggest elephant in the room is that the 'Paradox of Tolerance' immediately asks also:
Why is Foalcon and Rape allowed then but Nazi is not?
There is no evidence that Drawn Underage Pornography does NOT make you a pedophile. Studying pedophiles is hard since they tend not to want to identify themselves. Japan is a pretty awful place to look for crime statistics because their crime rate is kept so low by…not prosecuting anything they don't think they can get a 100% conviction on.
The only evidence we have is that access to pornography may reduce irl offending chances. Although you could say the same thing about the right-wing-death-squads, right wing terrorism has only been rising in recent years afterall as censors have been banning nazi and racism more. Would that not directly contradict this entire argument? And hasn't several communities such as the fighting game community been absolutely destroyed recently by piles upon piles of allegations of pedophilia? Should this not be an even bigger worry for bronies with a fandom of very diverse ages? (I joined in 2010 when I was 14).
Of course if you look at who pushed for the Nazi-DNP, you can see that they aren't interested in banning foalcon…