this is just ridiculous. although I know plenty of white people check "other" to make it SEEM like they are some kind of minority without actually having to choose one of the minority statuses.
They probably just don't want to be discriminated against. It's not so much that they want to be seen as a minority, they just don't want to be labeled as a "privileged" white person.
This is probably more of a problem for asians, however, who experience the most discrimination in admissions, and are therefore probably most likely to check the "other" box.