1. the use of violence and threats to intimidate or coerce, esp. for political purposes.
2. the state of fear and submission produced by terrorism or terrorization.
3. a terroristic method of governing or of resisting a government.
So, one would think that countering terrorism would involve resisting coercion by resisting fear and submission.
That's not the case in Washington, D.C., where Metro officials plan to start random searches of travelers' bags. Not because of any specific threat, but because "Americans everywhere are at some risk from terrorism."
Let's get something out of the way first: Random searches do not provide security against terrorist acts. If it comes to it, a bomber can inspire fear just as well by exploding a checkpoint as he can by bombing any other part of the Metro system. Other kinds of attacks can be snuck past random checks or even comprehensive checks. Random searches are security theater, designed to make it seem like something protective is being done when it's not.
What random searches do is reward past acts of terrorism by demonstrating that they have successfully cowed our society, made it fearful, and subject to coercion. This will tend to encourage future acts of terrorism. Seven years later, the 9/11 attacks are still paying dividends.
Searching at random in the Metro system plays into the terrorism strategy. Metro officials mean well, there can be no doubt, but they're patsies to terrorism.