>correct me if I'm wrong, but is this not eating your cake and having it too?
You didn't really say if those people think loli is bad or not pga. mind crime.
The point in the loli argument is that the person can't be hurt, or if we put it in a general term, they can't be moved (the can't be affected and can't have an effect).
The point in their 2D argument would have to be that 2D can't be moved either. So even if you love or want to abuse 2D, the love will never exist outside of your mind. If any of you refute that, then you don't really stand on a common ground and probably aren't going to.
In the end it's about whether you like 2D or 3D. They probably like 2D too, but mistake their feelings for 3D as being important to them on a higher level than their basic instincts.