As Patrick Henry is often quoted as saying, "Give me liberty or give me death," and those could very well be the choices in today's world of airline travel. That said, it's impossible to fully scrutinize every possible venue where a terrorist attack might happen. In a way we're fortunate with the fixation on aircraft and large buildings but think of all the regularly scheduled, large public gatherings with virtually no security that are held everywhere all the time. I'm not advocating TSA type security everywhere because it would be wrong as well as impossible to carry out, but I'm very suprised there haven't yet been multiple, simultanious attacks on venues in the US on say a Friday night or Sunday morning. There are a lot of easy targets out there.