Unlike the CIA and/or FBI being in charge of preventing attacks like 9/11, NSA and DHS aren't in charge of each state's or city's infrastructure. They could run

Unlike the CIA and/or FBI being in charge of preventing attacks like 9/11, NSA and DHS aren't in charge of each state's or city's infrastructure. They could run some opt-in program that local governments could then engage with, but "negligence" is a bit strong for systems they're not in charge of and have no access to.