Yes, that "logic" is no logic at all, except that which limits free will and individual liberty, and increases government power.

I guess it's the "inciting to riot" logic, where the
*victims* of incitement are thus cleared to respond
violently. . if my shirt incites you to riot, it is still
your riot. -- j

barred students from wearing shirts bearing the U.S. flag on the Cinco De Mayo holiday, “because other students might have reacted violently.”
Who specifically are the idiot judges that agreed to uphold this ridiculous ruling and what do they gain by it?
Yes, I attack the judges and charge that they are guilty of placing other issues (perhaps for personal gain) above the inherent constitutional rights of individuals.
Its the people who threaten violent action that should be "educated" with a couple of nights in jail and a class on the US Constitution with emphasis on the rights that their threats endanger.

Yeah but these were offensive words like "Hope" and the US flag. [that was sarcasm]

I suspect the school's actions are part of a deeper problem, not a desire to protect people from offense. That doesn't make it okay. There's no excuse for censorship.