I guess a lot of people in general have problems distinguishing fantasy from reality.
Reality = real people, real crime, real victims.
Fantasy = drawings, imaginary people (or actors), no victims, no consequences for the victims.
People say that if you look at lolicon you must be interested in child sex. That you will probably go on to become a child abuser (there is no evidence for this). There is evidence that child-abusers can also be in to lolicon. But there is no evidence of progression from one to the other.
Ever fantasised about having sex with a pin-up model or actress (I'm sure we can all name many hot ones

)? Yes? So why aren't you in jail? You are clearly about to stalk them followed by rape and murder. Obviously, duh! Thinking about it means you must want to do it for real, no?
There's a huge problem in assuming that what we watch determines how we act.
Ever seen Saw? Did you violently torture and murder someone after? Probably not.
Ever played Call of Duty? Did you end up joining the forces? Probably not.
Ever look at lolicon? Did you rush out to find a child to abuse? Probably not.
We're already part way down the road to future-crime being a thing. Or thought crime, if you prefer. The laws of this country already make looking at pictures of girls/cartoon girls dressed like schoolgirls illegal, if the suggestion is that they are underage. Even if they aren't (in some cases because they don't exist!).
It's nonsensical populist legislation to ride on the wave of "think of the children" emotion. It shouldn't be a crime of there is no victim. Simples.