Imagine you're a secret service agent assigned to protect Trump. Your whole organization got raked over the coals when someone took a shot at him and managed to make him bleed. So, as a dedicated secret service employee, you really want to do your job well, and try to think of anything you could be doing better, trying to find any way to tighten things up to make sure your protectee stays safe.
And then, one day, he just decides he's going to go for a walk on the roof of the White House for no apparent reason.