Also, would govt stepping in even help? We all know where that led to with the "war on drugs" in the US. I think there is no simple/easy fix.

My view is, you need to educate parents (backed by solid peer reviewed etc studies), and give them the tools (and free time) to help their kids. Most parents I know are too busy working to put food on the table to spend time encouraging their kids not to watch trash tv/youtube.