Mike Masnick has written a review of Haidt's book, and it's a nice rebuttal to each of these arguments.

https://www.thedailybeast.com/the-coddling-of-the-american-p...

One of the points he makes -- and that I don't see much discussed when it comes to Haidt's work -- is that Haidt's prescriptions for a solution are dangerous. If Haidt is wrong, one of the most unsettling consequences of relying on his solutions is that we stop looking for the real causes of any degradation in childhood mental health. Even if he's right, his solutions will have all sorts of unintended consequences, including loss of privacy on the internet, lack of access by children to resources that are in fact helpful to their mental health, and violations of various legal and constitutional human rights frameworks.