Given that we now know that it was well-known to experts and people in charge that the attic was a tinderbox, and that the roof and vaulted ceiling would preven

Given that we now know that it was well-known to experts and people in charge that the attic was a tinderbox, and that the roof and vaulted ceiling would prevent firefighters from spraying water to extinguish a fire in the attic, and that there were no sprinklers installed there, it would make sense to treat any fire alarm as an actual emergency, as the consequences of even a slight delay in the event of a real fire were high.