It's technologically doable

I'd disagree here. Sure in theory you could design some system that authenticates every user on every connection but in practice it would be impossible to maintain without complete authoritarian oversight like North Korea. Even closed authoritarian countries fail to achieve this (like Iran or China).

This would cost billions of not trillions in implementation, oversight overhead and economic product loss. That money would be much more effective in carrot approach of supporting mental health institutions and promoting wholesome shared culture, anti bullying campaigns etc.

It's not a new problem either. We know for a fact that the latter is the better solution and yet here we are...