Luckily, I am no law maker but a random guy with opinions on the internet. But no, I would not say that we should ban every depiction of non-adults from all media. That would be way to broad. And I am not saying the "what" and "how" is something I can answer nor did I think about it in detail. I think the rule "should" be something between what we have now and what what you suggested (and what my original post might suggest). Where exactly, I cannot answer. But thanks for pointing out that my original formulation was lacking.