Confused Coworker

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Here's a photo of a car from work:

(I've taken the liberty of blurring out his license plate number.)

On this older economy car, there are:

  1. One bike rack
  2. One "Live simply that others may simply live" bumper sticker
  3. One "Defend the Earth" bumper sticker
  4. One "Dismantle the Nukes" bumper sticker, slightly worn
  5. One Bush-Cheney '04 bumper sticker

(Cue Seasame Street music: "One of these things is not like the others/One of these things just doesn't belong")

What is the story with this car? Did the owner buy it used, with the environmental stickers already attached? Is the owner being ironic? Perhaps he's one of those "crunchy" conservatives, who cares about the environment (but in that case, what's he doing voting for Bush?). Or maybe the owner is a triffle confused. Or an idiot.

These are the only explanations I can come up with, and yet each is dissatisfying.