Lots of problems in society that are hard to fix. But there's nowhere else in society where our solution to a problem is to subject people who had nothing to do with the problem to unfair treatment. "Two wrongs don't make a right" is a good general principle.
It depends how you conceptualize fairness. If you believe that some people have a pre-existing unfair bias in their favor, then applying a countermeasure is indeed fair.
If only it were actually that simple and fixed with platitudes. Culture and belief is passed on from generation to generation, otherwise we wouldn’t have had the persistent problem in the first place. How do we fix a problem that we already have historical evidence that when left alone doesn’t go away on its own, that people who weren’t the original cause of the problem still, in fact, perpetuated it? How can we know people have nothing to do with the problem today, given that there are still discrepancies in outcome? I’m not defending Affirmative Action, the question at hand is what’s the alternative proposal?
Hm. How does this vibe with your blanket judgement about Bangladeshis?