As bad as anthrax is, that amount of decontamination was overkill IMO.
The real problem here is a failure to recognize where the "most likely threat" originates ~ as Barbara Hatch Rosenberg should have taught us, as she maneuvered, lied, manipulated, and harrumped her way through hearing after hearing, just look to the people she was protecting by misleading the FBI into various and sundry middle aged white scientists.
Today that same crowd she protected is in charge of the government.
Not likely we'll see any bio attacks while they're in power, but give'em 6 to 8 months out of power, and they'll be back at it.