The only complete analysis is risk vs. benefit.

We don't look at heart transplants and say "look how many people died! we should ban them"

We can't regulate social networks or ban AI because of heart transplants?

Technological progress doesn't happen in a vacuum. It's almost certain that social networks and AI will contribute to a future life-saving technology, simply by virtue of the information exchange they enable.

I don't know how you jump from "innovation doesn't happen in a vacuum" to "we will never innovate again if we regulate social network use by teens".