If they can't control said technologies, and put backdoors in them, then they'll make them illegal. That's a non-starter. A solution can only ultimately occur in D.C.
And if they make them illegal, they'll have their day in court.
I'd tend to agree the right place to start is building a technological solution to the problem. One that people actually will want to use.
Why not both? As we know, D.C. isn't always reliable.
Then you make new versions of said technologies that are harder to track/identify.