Maybe I haven't made myself clear. I am not arguing that "using" child porn is not a crime; it plainly is, in my country at least. I don't think it should be, though, as I have said. Its production should continue to be a very serious crime, for obvious reasons. For what it's worth, I see nothing immoral about drug production or use, and consider drug prohibition another pointless and destructive law.
As for your second point, yes, it might. Or it might not. Either way, speculation such as this does not belong in a legal setting. And if you take your thoughts to their logical generalised conclusion, watching anyone do anything bad at all makes you partially responsible. I don't agree with that, of course, and I doubt you do either.
Anyway, I've said all I'm going to say on this - I was just trying to make a point, I'll bow out before things turn any nastier.