> It's popular in Australia according to polling
depends on how or who you poll. I dont think it is popular. It's just that there's a lot of stigma when you try to argue against "saving the children" type policy - which is why this gets used to pass laws that otherwise would be difficult to pass if the true intentions were revealed.
> Credibly fixing
"credibly" is carrying a lot of weight here.
The polls I've seen show banning social media for under 16s has 70-74% support in Australia and the UK, with about 20% opposed.
What polls are you looking at?