Affirmative Action

https://www.nytimes.com/2017/08/02/us/affirmative-action-battle-has-a-new-focus-asian-americans.html: 

This link above writes about Affirmative action and how it's upheld or violated, depending on your point of view, in colleges in USA.

The article above refers to an Asian American being rejected by Harvard university despite being very well qualified for the reason that Asian American admissions far exceed their representation in the American population.

From the Asian American's point of view, the university's rejection of his application is unfair. But when Asian Americans (and earlier Jews) take up most of the seats available who becomes the disadvantaged group? The whites, hispanics etc. And affirmative action works in their favor now. 

If the criteria for selection is not only merit but also diversity then someone who is good has to lose his seat so that someone else can be allotted the same seat in order to provide the said diversity. 

If Asian Americans get 50% of all seats while they constitute only, say, 20% of the population then don't the rest of the races become disadvantaged? 

If women make up 70% of all CXO positions, won't affirmative action kick in and try to get more men into executive position, regardless of whether the men had merit or not? 

Affirmative action exists to help groups who are much less represented than their population "warrants". And if one group does exceedingly well, then it will start losing seats in order to ensure affirmative action still applies. 

Affirmative action thus exists to prevent monopoly of a race or gender or whatever.

Additional reading:
https://www.washingtonpost.com/opinions/black-people-arent-keeping-white-americans-out-of-college-rich-people-are/2017/08/04/e478952e-794a-11e7-8f39-eeb7d3a2d304_story.html?utm_term=.7e1c71bb5212