When you observe renowned landscape artist John Constable’s bucolic painting “Hampstead Heath” above, what feelings does it inspire? Calm? Nostalgia? Spiritual uplift? A surge of white supremacist pride and jingoistic fervor?For some reason – my guess is a toxic mix of colonialist guilt, multiculturalist self-loathing, and pressure from neo-Marxist donors and administrators determined to “deconstruct” Western civilization – England’s Fitzwilliam Museum, owned by the University of Cambridge, recently overhauled its collections with new signage warning sensitive visitors that landscape paintings of the British countryside can evoke dark “nationalist feelings.”Paintings at the Fitzwilliam have been reshuffled into new categories that are...