> Dissatisfaction with growing wealth disparity at the time was a fundamental trend that could not have been "nipped in the bud".

Well, this was the whole idea of "Fabian" socialism, named after Fabius the Delayer: bring in reforms now, otherwise revolution will happen outside your control. A big part of the foundation of the UK Labour party.

It seems to me that the BLM movement is just such a "big bang" against a slow increase in racism and very long term failure to resolve problems in Americna policing.