The overall quality of America's educational system is not fixed-sum. We should be creating a dozen more TJs for every one that currently exists.
To narrow down more surgically on the issue here:
> Many progressives believe in affirmative action, which doesn't say anything about the particulars of the groups that aren't being explicitly included. Nobody at all is interested in exclusion; they are interested in more inclusion.
This is incorrect. Affirmative action is absolutely just as much about exclusion as inclusion. Advantaging one group is the same thing as disadvantaging all other groups. And yes, the mainstream progressive platform is to advantage minorities other than Asians - which is the same thing as disadvantaging Asians.
My company tried to pull this argument when proposing a larger bonus to recruiters for hiring diverse candidates. "Oh it's not disadvantaging any group, it's just being more inclusive towards diverse groups". But it's not. The company phrased is as an extra $250 to ($500 vs $250) to inspire recruiters to be more inclusive towards women and URM. But you could say the normal bonus is $500, but there's a $250 penalty for non-diverse candidates. Advantaging vs disadvantaging, and inclusion vs exclusion. They're all two ends of the same lever.
The reason for disadvantaging Asians (and Jews) is that it has always been fashionable to do so. This was true long before the Chinese Exclusion Act and, in the US, it seems it may always be true.
The change to subjective admissions criteria that led to a drop from 73% Asians to under 50% at Thomas Jefferson could be said to be more inclusive of the races that saw increased representation. It's also correct to say that it's more exclusive of Asians.