Not that it's an excuse for what they did but why the hell would you suddenly spout "I am not a terrorist" when no-one has even implied as such. Yeah that's helpful to calming strangers in any situation, just suddenly say that without any reason.
Because if you can't do that, what's even left for terrorists to destroy? And how is lying, claiming he took more pictures, an appropriate response? How can you possibly rationalize this to be the fault of the OP? As a comment to that story points out, that's a big part of how society got to such a low point.