This seems disengenuous. Is there any way to implement E2E encryption that wouldn't "put children at greater risk" if we accept that framing?
I understand why the Government and child welfare organizations don't like the idea of E2E. It would, in fact, make it more difficult to identify child abuse on social media, all else being equal. But the attempt to balance privacy with child welfare doesn't have to mean abandoning privacy altogether.
An alternative would be to require social media companies to allow parents to monitor their children's social media activity. Or to have "child-friendly" accounts without E2E. It doesn't seem necessary to impose a blanket ban on E2E, which would almost certainly be abused.