> Which means, IMO: (1) regulation should be limited to what the general public's gut on average agrees with, since science won't be the neutral arbiter we want it to be for the foreseeable future. (2) I personally want to severely limit my kids access to social media because my gut says it's addictive and harmful. But I don't expect society as a whole to agree with me on that.

Well:

(1) there is no "the general public's gut" -- the general public is millions of separate guts that don't agree with each other;

(2) our political system defines explicit boundaries for the reach of regulatory power, especially where communication, expression, and social interaction are concerned, regardless of anyone's gut feeling on these issues;

(3) science can't be the arbiter here at all, since science only answers "is" questions, but this is an "ought" question; which leads us to

(4) as you alluded to in your final remark, this is a purely cultural issue which families/parents must address according to their own normative values, independently of each other, and there is no legitimate political or legal question here.