As one of the few posters who did suggest that the Mexican-American students might be the source of the possible violence, I'll address the bolded. It isn't a racist suggestion at all. It's based on this line from an
article which has additional information about the incident:
At an earlier meeting, Principal Nick Boden and Rodriguez indicated to her that they were worried about the safety of the American-flag boys.
They didn't say they were concerned for the safety of the Mexican-American students, they said they were concerned for the safety of those who were wearing the American flag. Unless you are assuming for some reason that the American flag wearing students are going to turn on each other, the logical assumption is that they believed there was a possiblity that some - not all - of the Mexican-American students would resort to violence. I honestly can't see how that could be racist. As others have mentioned often in this thread (and as I'm sure you are aware since you are a school administrator) the administrators usually know who the problem students are. If they are concerned about some students being violent then there's probably good reason for that, and there's nothing racist about it. But if somehow it is racist, then you'll have to blame Assistant Principal Miguel Rodriguez and Principal Nick Bolden for their racist assumptions, because those assumptions aren't coming from anyone here.