"Terror is a tactic," Joe Biden says. "Terror is not a philosophy."
Gwynne Dyer adds that it is a mantra that everybody in US politics should be required to chant each morning before work, even if it is slightly inaccurate. Terror is actually an emotion. Terrorism however is a tactic - a political tool or technique, more precisely - that can be used in support of a variety of causes. It is as misleading to declare war on terrorism as it would be declare war on propaganda.