Is there a psychological driver behind feminism?

To date the most Gender equal societies have been the communist soviet empire and the regimes in the influence of Maoists. In their heyday these regimes worked hard to eliminate any semblance of natural variation.  Among their  achievements were  a still unsurpassed vocational plurality amongst women, very much higher proportion of economically active women than the “west” and female participation in high risk roles. Pretty universal state childcare and comparatively few officially part time jobs. Little or no maternity leave meaning long uninterrupted careers. After all in a workers state everyone has to be a worker. In fact very much greater equality of outcomes than the  “Swedish model”. 
Of course the cost of this was high in terms of the oppression needed to crush any human variations, ambitions or proclivities. Including those influenced by biology. 
Indeed the sheer effort those societies had to devote to oppression is perhaps a measure of how strong nature is over nurture. Despite the efforts to educate their populations to be good gender equal socialists/communists. 
 I wonder why modern feminists don’t uniformly laud such equal societies? Could it be that often their own people eventually simply stopped believing in their rule or in China the party stopped  believing.  Or perhaps it is the realisation that the truth is that  those regimes demonstrate that the achievement of their kind of equality requires multiple oppressions by the state. Oppression that begins with manipulating justice to achieve policy and bypassing  democracy (as the people have a “false consciousness ” if they disagree). 
An echo or ghost of this feminist heyday is found in the fact that Sweden is only middling on the measures of gender equality  in the EU . The really “equal” societies can be found amongst the new EU states from behind the “iron curtain” .