But they helped us catch the suspects . . .

. . . and knowing that today terrorists aren't likely to get away with such crimes without being caught will deter other would-be bombers from doing so in the future. It won't deter all terrorists, but it will deter many.

Sorry, but I actually support cameras being in public places. Those in public locations have never had any guarantees of privacy. That is not new; it is long-standing precedent. If someone is in a public place, photographers' right to capture them on film, whatever they're doing, has been upheld by courts time and time again. There are two exceptions: the first it is a recent one--the public photographing or filming of unknown children by private citizens--but even that is not universal. The second is the photographing or filming of things which would be considered indecent. Of course, there is no fixed concept of what that means, and that is problematic just as it is in private settings.

Anyway, I don't know why people get bent out of shape about public filming and photographing now. This has been going on for ages, and I'm glad. It means I am less likely to be the victim of a mugging, murder, etc. in a public location, and I don't do anything in public that would cause me to worry about public surveillance.