Terrorism can't "win" the same way the idea of a "war against terrorism" or a "war against drugs" is rediculous.

Terrorism can succeed or fail in taking lives. We can succeed or fail in stopping individual attacks. We cannot stop the process of terrorism by waging war against major groups that make use of it. We can, however, reduce people's willingness to use it by dealing with other problems such as poverty and lack of education.

The "war against terrorism" can't be won because waging war doesn't effect the process of terrorism. Terrorism can, however, be stopped, and in this regard the "war on terrorism" can be "won". I don't agree with the war in Iraq as a war against terrorists. I do, however, agree with the war in Iraq from the position that removing a genocidal dictator could potentialy improve the standards of living in the area to the point that terrorism will no longer be seen as an effective or desirable means of communicating one's ideals.

Violence against terrorists by itself isn't going to stop anything but it is necessary to stop terrorism.