All true, and I think you and I agree more than not. However, the MAS program was never shown to be "primarily for pupils of a particular ethnic group." Any kid could take the classes, just as any kid can take African-American studies for example.
Additionally, Tom Horne's opinions in a campaign do not law make - he is not (yet) on the state Supreme Court. He picked a hot button idea and rode it to election. Same with Huppenthal, his successor.
I have never sat in on one of those classes, and (I suspect) nor have you. I don't know their worth, and shutting them down may have been the right call. But TUSD still had a choice - people and agencies take the state to court all the time to determine what is right. Just because he doesn't like the program, and rants and raves to shut it, does NOT mean there is no recourse for the district.