That belief is only held by people who are deeply programmed to expect equal outcomes across any arbitrary demographic partition - i.e. they expect that career

That belief is only held by people who are deeply programmed to expect equal outcomes across any arbitrary demographic partition - i.e. they expect that career interest and fitness is completely independent of cultural background, sex, etc. For people who weren’t successfully beaten over the head with a standard US progressive education, this is obviously a priori very unlikely.