It's the reasonable part that bothers me. "Hi there! We don't know who you are and we don't care, but we're going to presume that you're doing or carrying something that indicates criminality. Show us your stuff. Now. Or go away. Oh, you use the subway to go to work? Too bad, bitch. You should've opened up for us. You must be some kind of criminal or pervert or terrorist or something and you aren't entitled to use the subway if you aren't willing to have us go through your stuff."

I pay $2 for a train ride- less, actually, since I usually buy monthly passes. It's public transportation. It's a substitute for my car. I shouldn't be turned away from public transportation because I want to maintain some modicum of privacy, unless there's a really good reason for them to suspect that something big and ugly is impending. The curtailment of free speech in the event that it creates a clear and present danger is reasonable; the curtailment of free speech in cases where there might be a danger is not. Same here.

Besides, I have no faith that this is going to make anything any safer. Unless they search everybody, they're going to miss somebody- they miss them on airplanes and they have far fewer people to search. So they're basically conducting a search for no good reason to no good effect.