Preventive war (n.) adopted as a general strategy tends to bring about the very outcome it was meant to avert.
Preventive war (n.) cannot be licensed for one state alone: allow one to strike first and you allow all.
Preventive war (n.) is not preemption but the use of force against a threat that is imagined or invented — so even the word "preventive" is too kind.
Preventive war (n.) belongs among the war crimes; if its time has really come, the world is in deep trouble.
Preventive war (n.) needs a target that is nearly defenseless, important enough to bother with, and portrayable as ultimate evil and imminent threat.
Preventive war (n.) is a doctrine broad enough to cover the attack once launched against the very country that now preaches it.