'Whites-only' isn't diversity
A Texas scholarship that excludes nonwhites betrays ignorance of the point of minority aid: an attempt to counter centuries of white privilege.
That understanding is sometimes called the "symmetrical view" of race. It holds that whites and minorities are similarly situated and that programs that exclusively benefit whites are as legitimate as those that serve minorities. Sometimes, as with the Texas scholarship, there is an additional argument that changing demographics have reduced the advantage of being white in this society.
This symmetrical view ignores history. Scholarships and other arrangements that favor racial minorities are generally an attempt to counter the effects of centuries of white privilege. And despite what some people might believe, those effects haven't gone away. This country has done much to overcome its history of racism, but gaping disparities in education and wealth persist. Scholarships and other programs seeking to close those gaps naturally will focus on blacks and Latinos.
If you disagree, prove that whites and minorities are 100% equal at all levels of society. Good luck with your answer...you'll need it. (And not, pointing to Barack Obama and Oprah Winfrey doesn't make the case.)
For more on white privilege, see Pro-Tribal Legislation Spurs Conservative Threats, The Last Acceptable Racism, and Wicasset Loves "Redskins," "Yellow" Japanese.