You want me to support your political campaign to regulate the gas that I exhale, because otherwise there will be a doomsday, and if I don't agree I'm either stupid or evil? Ehhhhh, no thanks
This sounds like at least a mildly stupid mindset to me. "Some people associated with your movement made an assumption about me that I don't like, so I'm not going to participate regardless of its merit."
If not "stupid", how about "spiteful, stubborn, and unwilling to face hard truths"?