Yes. Based on what I've read, abusers typically trade with other abusers in more private ways.

So you catch these guys and follow the trail from there. Just because you don't reach your goal with your first step doesn't mean that it's not worth making that step at all.

What are you attempting to say, that the images shouldn't be filtered because they aren't from the original source?

I think the implication was that the uploaded are not the perpetrators, so reporting them is unlikely to reduce abuse. I'm not sure I buy that line of thinking. I suspect plenty of perpetrators upload in public forums.

very true, but there is still the possibility that it was copied recently and the authorities are not aware of the source. even more reason to report these people so that the authorities can reduce the amount of "hops" to find the origin.