Well maybe this will help you understand, Ill tell you about my experiences with it.

At one point, I was looking at girls my own age as desirable sexial beings (not objects...). Doing that with porn is illegal and I knew that so when I eventually stumbled upon loli I was interested. The problem is once you realize that thats attractive to you it didnt just go away. I've never looked at actual children like that, because I didnt want to look at porn when I was a child. Started more in my teenage years but with the anime style stuff it can be hard to differentiate 14-15 from 12-13, so it all gets kind of lumped together.

I have no desire whatsoever to rape or abuse anyone, underaged or not, because that would be fucked up and I dont even get off to cruel stuff like that. Not to say that people that do like sadism or whatever are willing to attack people. Anyway even aside from that its not like Im staring at real life children or teens all the time either, because I can and have actually had girlfriends and adult women can have all the traits I find attractive, same as I look for in porn, loli or not. My porn habits just happen to include some of the same stuff I liked at 15. And I dont see why that should be taken from us.