...listen for a minute.

Bruche Schneier says it perfectly:

"I'd like everyone to take a deep breath and listen for a minute.

The point of terrorism is to cause terror, sometimes to further a political goal and sometimes out of sheer hatred. The people terrorists kill are not the targets; they are collateral damage. And blowing up planes, trains, markets or buses is not the goal; those are just tactics. The real targets of terrorism are the rest of us: the billions of us who are not killed but are terrorized because of the killing. The real point of terrorism is not the act itself, but our reaction to the act.

And we're doing exactly what the terrorists want. [...]

Imagine for a moment that the British government arrested the 23 suspects without fanfare. Imagine that the TSA and its European counterparts didn't engage in pointless airline-security measures like banning liquids. And imagine that the press didn't write about it endlessly, and that the politicians didn't use the event to remind us all how scared we should be. If we'd reacted that way, then the terrorists would have truly failed.

It's time we calm down and fight terror with antiterror. This does not mean that we simply roll over and accept terrorism. There are things our government can and should do to fight terrorism, most of them involving intelligence and investigation---and not focusing on specific plots. [...]

The surest defense against terrorism is to refuse to be terrorized. Our job is to recognize that terrorism is just one of the risks we face, and not a particularly common one at that. And our job is to fight those politicians who use fear as an excuse to take away our liberties and promote "security theater" that wastes money and doesn't make us any safer."