@AcademicAgent_X Its likely that the US did not expect this seeing as there have been many claims that they moved personnel out of the bases and into the hotels as temporary safe zones.
(this is unverified and might be a post hoc justification)
@HarmlessYardDog Western interceptors are a very limited asset. Getting Israel and the US to fire dozens of them a few missiles every 15 minutes will make follow up strikes much more effective. Or they are going for slow and continuous instead of a few big waves once a day.