It's not an issue of whether they can get backup or not.

(And I don't agree with that anyway a night guard can call 911 and get the police pretty quick.)

The issue is whether there is a single person monitoring the network or several or even two. And is the coverage different during "working" hours? And what about the skills of the person monitoring at 1am vs. during the day?

Seems that after something happens people wise up to the weak points. Remembering the case of a single air traffic controller in some towers and after something went wrong there was such shock that only one person was on duty with no backup.