Peter, I know your interest in pursuing this conversation any further is limited,

[Burney]

True leftism should stand full square behind enlightenment values and by extension western civilisation, despite critiques of capitalism and imperialism.

Yes. But it doesn't. Leftism and anti-western/identity politics are now inextricably intertwined, I'm afraid. Given a choice between the west and pretty much anyone else, they'll back the anyone else.