The same can be said about guards protecting an exit, and, in all honesty, security portals probably present fewer risks than guards, especially armed guards, w

The same can be said about guards protecting an exit, and, in all honesty, security portals probably present fewer risks than guards, especially armed guards, where there's a reasonable possibility that building management will risk a lawsuit to forcably detain someone trying to leave: false arrest alone is better for all parties involved than false arrest plus battery and likely injury.