It is like saying that you should not have free speech because someone might influence 70+ to say stupid stuff (well, that is already happening...).

Family should be responsible on education or making phone of people that are not educated enough (minors, elderly, etc.) limited - I do that using Family Link. I have there my child and also my in-laws - both of them can't install new apps without my permission.

So the tech is already there, one just needs to use it.