I don't really get that undercurrent to the decision making processes here.
Yes, NYC's specialized public schools have become heavily disproportionately filled by its Asian and Asian-American population.
The competitive forces and consolidation does a disservice to them and the rest of the admitted population as well.
When a 4.2 GPA overachieving student can't get selected to good universities or other opportunities because of all the 4.5 GPA students at the same school, that undermines the point of the system. And that system also has the side effect of exacerbating segregation?
And you want to defend it by making it about other Americans focusing specifically on disrupting Asian achievement? I understand your sentiment is and has been shared and represents a collective assumption with some groups in NYC, but its a huge stretch! The other perspective is that it just doesn't accomplish externalities well. Mix the schools up, let cultural overachievers be dispersed instead of consolidated, the mindshare will help the overall local population better.
I agree that public schools should be about education, so focus on fixing where the education occurs. Try to get better teachers and materials to other parts of the city! Yes, if your child is trying to go through school before any of this better infrastructure is set up, I can see how defensive one would be about it, I can see why the low hanging fruit of "they dont want us/my race to win" is the goto argument, but all I can say is.. welcome to the rest of the country? Shitty public schools is the most American thing ever!