Because childhood nutrition, healthcare, schooling/community and other living conditions are huge causal factors towards a talent pool of people who are prepared to pass a software engineering interview? The original complaint here is all about 'seniority' being inherently unfair due to those societal conditions.

Trying to 'unbias' (meaning a calibrated, countervailing bias actually) at the other end of the funnel, where incidentally 80%+ are already super liberal, doesn't really get the same mileage.

Ok, if we do assume those things do fill the funnel, what do you do foe the next 20-30 years while you wait for those changes to pull through? Tell the folks to “sit tight, we fixed it”?

Well, we're not going to hire software engineers that don't exist in the name of equity. And, yes, the answer to 'how do I do better in this seniority system' is literally always 'wait', no matter who you are.

If people are primarily upset about general societal things rather than clear cut workplace discrimination, I would submit they should focus their activism at those societal things.