Am I the only one that has noticed that the ID the guard was apparently asking to see was a Bus Pass issued by the Federal government because the bus crossed a Federal facility?
Seems perfectly reasonable for a gate guard to ask bus passengers to show their bus passes. That she had been issued such a pass means that she had already been checked against a "list" and had been approved for the pass; there was therefore no need to check her against another list. That is the purpose of issuing passes, after all. For that matter, asking to see such passes is the purpose of gate guards.
Now, here, the woman was being just plain rude. In a way, she was provoking the police. This doesn't excuse the rough handling she then received, but neither was it designed to put the cop in a more charitable frame of mind.
As for what actually happened during and after the arrest, we have only the woman's side of it. In fact, the entire story seems to be single-source hearsay.
Finally:
This is just plain wrong. By entering a government facility you inherently give permission to be searched. Not just for ID, but your person and possessions.
Edited to sanitize image.