I think it's because the rules changed in the 60's and 70's about "rights".
Blacks were only about 10% of the population. But they raised hell about civil rights and society responded.
Women were over 50% of the population, and a large percentage of them fell for the feminist rights argument. They raised hell about women's rights and society responded.
Thus the rules changed -- and by 1980 or so, all it took to gain unlimited power was to raise hell and claim your rights were being suppressed.
As long as you're not a white male. We don't have any leverage in this regard.