I don't agree that the SB is equivalent to a college football game or other large event. But I will compromise, any event that draws over
100Million viewers and over 5000 world journalists, on US soil, the government will help address security issues, anything less and they are on their own.
On the other hand, if it was announced that the NFL was required to fund security, or even reimburse govt expenditures, I would be ok with that as well.