You're pretty naive if you think these guys get dressed up like they were Sinko Day Mayo every day of the year, or even any other day of the year. Like 99% of everything teenagers do, it was to get attention.
We need school administrators to keep kids safe in school: That's what happened.
We need public administrators to secure borders: That's NOT what's happening.
Three good points. But the rules should apply equally to all - rich, poor, smart, dumb, black, white, Hispanic, everybody. I graduated from one of the toughest schools in the country with the population separated into identifiable and not always compatible groups, but the teachers handled it. There is a fine line between attention getting and baiting, especially race baiting.
A T-shirt saying "I love Jews" is attention getting.
A T-shirt saying "I hate Jews" is race baiting.
T-shirts depicting the American flag or patriotism are attention getting.
T-shirts denouncing Mexicans or Cinco de Mayo are race baiting.
Good teachers know the difference between these two things and discipline the appropriate party who makes an issue of them.