I'm not sure what building you were in for the metro cards, but yeah there is usually a pretty strong presence of security around. I have never felt threatened on station, even back in the day when the surrounding area was less than desirable...
What is really unclear is why he was using the other guy's id, if he himself was an authorized contractor. And why that other guy's id was still active in the system if he was no longer an employee. Heads will roll over that, for sure, and I am betting sequestration and furloughs will be fingered in part of the blame when the root cause analysis is completed.
Still awaiting word from some of our associates at NAVSEA....it is pretty rough right now waiting for the names to be released.