Blaming Brexit for everything has become a kind of tic among the great and good. Like the buck-passing politicians who used to blame everything on Brussels, the cultural elites have taken to blaming all manner of ills on the British people’s revolt against the EU back in 2016. Economic stagnation? Brexit! Covid deaths? Brexit! Poor mental-health provision? That’s the fault of Brexit, too – according to some Guardianistas, at least.