L. Neil Smith said something to the effect of “If someone wants to take your guns away, it’s because they want to do something to you that you won’t let them do if you still have your guns.”
The mindset: "Achieving Eco-topia requires liquidation of many inconvenient, polluting humans...who are all bunch of redneck racists, anyway. The process of healing the planet and helping the oceans recede will go much smoother if the people who caused the problem aren't allowed to shoot at our lightworkers." :)