(I'm not sure if you're defending affirmative action or if you're just outlining its supposed purpose.)
There is zero way in which may post claims discrimination against Asians is justified by purpose of affirmative action and implying that I am doing so is a despicable bad-faith troll. Of course, the truth of the Federal Government's claim various colleges are discriminating against whites and Asians is a different corner of this debate, which is to say it's the thing looking at this would argue.
Asian-Americans were broadly excluded as enshrined by law in Korematsu v. United States, to say nothing of the discrimination that Chinese-Americans dealt with.
So... kinda odd that it is correct to continue to discriminate against them in higher education... isn't it?
The purpose of affirmative action isn't to cure racism, broadly defined as racial animosity or something similar. The purpose of affirmative action is to correct the harm caused by previous institutional bias (edit: a given institution previously systematically excluded a group and now is making up for that exclusion). Racial animosity and so-forth should be dealt with in other fashions.