Willow’s actions at the end of Season Six are more than yet another attempt to make her life pleasurable. They are an attack on the very idea that life can be pleasurable. Even the pleasure of waiting, of being bored, has lost it’s reality for Willow. All that is left is destruction, and destruction on a vast scale.
-James B. South, “My God, It’s Like a Greek Tragedy”; Buffy the Vampire Slayer and Philosophy