When will they (and we) ever learn?
The political pendulum always swings to extremes; unlike the harmonic motion of a mechanical pendulum, the political pendulum spends most of its times at the extremes, and relatively little time in the middle.
In the US, once white supremacy was put to rest via the Civil Rights movements, we embarked on a policy of non-white supremacy.
Do you think that's a crazy thing to say? I don't. If a desirable class of.. well anything... say government employment, university appointments, decent school occupancy ... was "under-represented" by favored-class (i.e., non-white, and more recently LGBT) percentages, merit was thrown out the window. It's especially galling in authority positions, because it leads to kakistocracy--government by the least qualified, or in the case of Muslims in the UK, government by those working against the host.
Someday, scientists will be studying the remains of America, and will talk about our going to the moon, and they will dig up millions of Incan Mexican indian bones and put the two together-- that 3-foot-tall American Mexicans went to the moon.