It's also the kind of idea that so frequently bubbles up in law enforcement: the eradication of visible crimes is more important than the eradication of the unseen ones. It's also because the visible ones are so easier to catch and give so much more TV coverage.
Going after the producers/abusers is the goal. Going after users do next to nothing to protect exploited children.
I have seen a similar attitude when I followed the investigations after I had a laptop robbed here in Brazil. Police officials were much more worried about catching the guy with the gun than the guy who bought the computers to resell. If you take down the guy in the spike, the buyer can quickly recruit another. If you take down the buyer, the hub, the whole "market" collapses for a while and crime drops (or migrates to other activities).
An that brings me to another story: when bank cashiers here started to use ATM-like equipment in their desks and had no meaningful amount of money easily accessible, bank robberies dropped to next to nothing. Interestingly, shortly after that, kindnapping spiked.