Anybody who has ever dealt with safety studies knows that you cannot protect everything against everything. you end up going for "ALARP", which, depending upon who is talking can ge defined as either, "As low as reasonably possible" or "as low as reasonably practical" You still end up with arguements about how far you can go with "reasonable" and what is the limit of "practical" or "possible"
When it come to these "what if" discussions in public, at what point does it become a thread for giving ideas to potential terrorists? If you have these wonderful ideas of possible terrorists scenarios, may I suggest that you keep your lips firmly together and your hands away from the keyboard until the urge to show how good you are at dreaming up these things passes. For the most part we are dealing with the brightest bulbs on the shelf, so why help them out?By the way, when studies are done about safety against terrorist or criminal acts as part of a project, the results are not subject to discovery under the freedom of information act.