Many people believe affirmative action programs seek to remedy past injustices in hiring.
These programs help balance current discrimination practices, especially in professional hiring practices.
The tall white candidate will get the job over the more qualified, better prepared minority 75% of the time.
Minority candidates with less than stellar backgrounds will not stand a chance against the perfect white candidate, however the less than perfect white candidate will still be in the running at the end of the day with someone on the hiring team supporting the person. I have worked on many hiring teams over the years and can bear first hand knowledge of this.