Yeah, that focus has worked really well in the "war on some drugs," hasn't it?
I don't pretend to have all (or any good ones for that matter) the answers, but we know interdiction doesn't work.
Those who are going to engage in non-consensual behavior (with anyone, not just children) are going to do so whether or not they can view and share records of their abuse.
The current legal regime (in the US at least) creates a gaping hole where even if you don't know what you have (e.g., if someone sends you a child abuse photo without your knowledge or consent) you are guilty, as possession of child abuse images is a felony.
That's wrong. I don't know what the right way is, but adding software to millions of devices searching locally for such stuff creates an environment where literally anyone can be thrown in jail for receiving an unsolicited email or text message. That's not the kind of world in which I want to live.
Many years ago, I was visiting my brother and was taking photos of his two sons, at that time aged ~4.5 and ~2.
I took an entire roll of my brother, his wife and their kids. In one photo, the two boys are sitting on a staircase, and the younger one (none of us noticed, as he wasn't potty trained and hated pants) wasn't wearing any pants.
I took the film to a processor and got my prints in a couple of days. We all had a good laugh looking at the photos and realizing that my nephew wasn't wearing any pants.
There wasn't, when the photos were taken, nor when they were viewed, any abuse or sexual motives involved.
Were that to happen today, I would be sitting in a jail cell, looking at a lengthy prison sentence. And when done "repaying my debt to society" I'd be forced to register as a sex offender for the rest of my life.
Which is ridiculous on its face.
Unless and until we reform these insane and inane laws, I can't support such programs.
N.B.: I strongly believe that consent is never optional and those under the age of consent cannot do so. As such, there should absolutely be accountability and consequences for those who abuse others, including children.