As a local resident, I'm amused by the "support" he gave - "photographing station security and determining peak times". Duh, Metro stations 1) don't have much in the way of security and 2) the peak times are the rush hours Mon-Fri.
That great exercise in spy work should have taken about 1 minute of research. I mean, seriously, it's a subway station. Like pretty much any subway anywhere in the world, if one wants to, they can pack as much explosives as they can carry into a backpack and get on a train. It's public transit.
Again, real terrorists don't even need to get their hands dirty these days. Find some rube somewhere, pay him a few bucks (or not) and a line of bull about hitting a bus stop, or subway stop, or carnival or fall festival or parade or whatever, and the government will go wild with news of their brilliant detective work. The media will eat it up, and the Kettles will be happy and scared at the same time.