Simplify, you obviously are not from a minority or multi-racial background. It is offensive to state that a person's race is an excuse. The reason many graduate schools take ethnicity into account is because of the unique challenges faced by people of minority and mixed origins. As a bi-racial person myself, I have faced many obstacles, such as exclusion from opportunities because of my ethnic background, and judgement from my peers because of being half white and half filipino.
Perhaps you should pause your judgement (and postings) on threads such as these when you have no knowledge of them.