The underlying assertion (and debate) here is that the value facebook is providing to society is worth the cost.

government censorship comes with a significant price to a society. Far to high as to push problems on it that amounts to bad parenting and consuming objectionable comments.

Do you reckon "de-scaling" Facebook would make the problem more manageable?

No, but it's more intuitive that it's unmanageable at smaller scales. Nobody thinks Reddit or HN could start pre-vetting all submissions in the first place.