The socialists and racemongers(quite a bit of overlap) can't stand the idea of anyone succeeding,

not in classes, not in life.  So they want to crush the ability of any kids doing better at something to get into an advanced class.

They'll ruin futures, they'll trash actual education, and claim it's all in the holy name of 'Equity'.  
They want everyone equally screwed.

And as their shit falls apart, they'll blame Trump and 'racism' for it.