I think there's a reason the us has been relatively stable over a long period of time, and it has everything to do with civil rights that serve as another check to the power of the government. As the balance is tipped in the favor of government power over civil power, the chances for large scale loss of life and limb (civil wars, internal power grabs etc.) increases.
History provides good examples of ever powerful governments, spectacularly collapsing, and crushing way more people than are killed from individuals abusing 'lax' civil rights.
It's probably not a good idea to mix the emotional with the analytical, but when it happens, the emotional wins; we're human beings.
I hate to get moral/philosophical, but utilitarian motives, in the eyes of societal norms, usually is the loosing position. The canonical example of this is the man waiting by the railroad switch who must decide whether to divert a train to certain doom or let the train run over an individual. According to society the man must always divert the train.
The super-parent argument is that the loss of life in the immediate is shallow compared to the inevitable loss of life from the loss of liberty and rise of tyrrany in the name of security.
If people are on the train, condemning many to die for one is never the right decision. If the train is unmanned (assumed if there is no conductor to manage it) you are trying to minimize loss of life, so of course you divert the train and just lose some resources in the crash. That example just doesn't make sense.
I'm much more concerned for the living than I am for the dead.
I've been in Colombia when some government buildings were destroyed by FARC bombs. People died, each one was a tragedy, but cities weren't shut down and society didn't let itself be overcome with fear. That's not to say they accepted that violence as OK; but the response was (and continues to be, as the FARC are still sometimes active here) very different.
I don't necessarily disagree, but I look forward to RMS's anti-terrorism proposal.
But to use a metaphor, it's possible to find a bug without knowing what the patch is.
This is very different from civil safety, or defending against terrorism. RMS takes the (in my mind very reasonable) view that terrorism is not costly if it doesn't provoke an auto-immune response, and that civil liberties are more important than obliterating terrorism.