It's not ruined, it's now a target-rich environment. If someone plastered a few conservative bumper stickers amid all the BS stickers the owner would never know it.
My parents' neighbor had a hippie-dippie daughter who drove a VW Microbus. (yes, sometimes sterotypes are true...) It was covered in bumperstickers, much like this picture.
Occasionally, Dad would make a "nighttime raid" on it, and stick NRA bumperstickers surreptitiously on it.