As for who is being harmed in a SEXUAL cartoon of children. No one is being directly harmed. But as described in my post above, if people are watching and masturbating to cartoon of children having sex with other children, they enjoy it it gets them off. If they keep watching it maybe a few of those people WILL want to go further on and watch more hardcore stuff.
Maybe that will save one life?
You're probably just as likely to go on a real-life killing spree after playing BF4. Ie, one person in ten million might go on to do it. Maybe.
But there is no causal evidence as others have said, that watching any amount of anime rape cartoons will eventually lead to real life sexual assault.
So either looking at cartoon abuse is a serious enough crime in and of itself to lock people up (won't somebody think of the imaginary children!), or we're firmly in the realm of preventing FutureCrime.

