Further expansion of the TSA seems a pretty universal nightmare to me. Maybe it's a bit out of place here, I'm not sure - their presence at train and bus stations wouldn't be a "new phenomenon" though[1]. I do think the TSA/DHS et al encourage unhealthy forms of paranoia[2], and my own experience with them warrants loathing. They've also hard-earned a pretty bad reputation, which doesn't exactly merit additional responsibilities.
