I don't see anything good coming from depriving teens of their freedom of speech as a scapegoat for mental health problems that are caused by other factors in the first place.

The problem is with a society where we deprive minors of their freedom and independence because we refuse to pay for basic public safety and basic public transportation. Instead, we make helicopter parenting into the norm and then blame the one domain (the internet) where they are capable of experiencing some freedom for the problems caused by a lack of freedom. If we actually want to fix the youth mental health problem, we need to ensure that kids can safely go outside and play or go places without parents having to follow them 24/7 like they could in past generations.