This will get awfully close to a political discussion, but I think you will all agree. So here goes:
These folks simply don't respect the concept of freedom and the basic right for anyone to pursuit his or her own happiness within the boundaries of the law.
I can relate to people caring for the environment and I can even relate to worries over rising levels of carbondioxide and greenhouse effect. What I can absolutely not relate to is the sheer ignorance these people possess. They don't share our passion and therefore it is convenient for them to point their fingers at us. I could easily point my finger at a dosen other hobbies or habits that compromises the environment, but I have no right to do that on others behalf. The automobile-industry is allready moving towards alternative fuel at a fast pace, so why not let us enjoy our vehicles untill we eventually buy newer, cleaner ones?
And throwing paint at trucks and SUVs certainly doesn't inspire motivation to go out an buy a small-ass city car.
Basically what I'm saying is that even though these tree-hugging nuts think they have a point, they're going about it a completely insane way.
Maybe we should make an Alliance Against Ignorant Eco-Fanatics...