[HIDEK6]

Why were they inside while President Trump was speaking?

[madison10]

Maybe they were watching security camera feeds.

[madison10]

Also, maybe they were watching feeds with earphones on

[madison10]

Also, maybe they were watching feeds with earphones on

[mellow velo]

The only possible 'legit' reason I can think of for why they were inside was that the SS was running shifts of several hours at a time and the building was their break area for having coffee and donuts in between shifts.  Perhaps iced coffee since it was hot outside.  /s

Short of that .. incompetence &/or complicity.