It would be impossible to 100% conclusively and with absolute precision determine the exact connection between the two. That doesn't mean it's not the best avai

It would be impossible to 100% conclusively and with absolute precision determine the exact connection between the two. That doesn't mean it's not the best available theory at the moment, that fits the most data. There are international, interstate, and even local level analysis all pointing to the same thing. There are longitudinal studies on children pointing to the same thing. And there are established and direct casual mechanisms in the brain biology that explain it. So what does waving a hand and saying "Nah nah can't prove it" do? By your standards do we have zero knowledge on all sociological matters, since it's impossible to design and implement a perfectly controlled study?