After the second or third, I wouldn't take the alerts seriously anymore. At least they are running their psychological and behavioral analysis operations there, instead of someplace like Hawaii:
I have no idea why you're being downvoted because that's perfectly fine argument. Alert fatigue is a thing. And if a missile really was headed towards there, well, all hell would break loose.
Alert fatigue is a thing true. But these are people living within a mile a launch site that's designed and sited to protect not just Alaska, but a good chunk of the lower 48. Missiles wouldn't necessarily be targeted at the fort.
The chain of logic is straight forward if you accept the premise that it makes sense for the site to be in an alert state for all North Korean missile launches.
https://en.wikipedia.org/wiki/2018_Hawaii_false_missile_aler...
Also, if they are worried about North Korea missiles being an actual threat, then they should take up their concerns with the President.