Taxing and stopping externalities has nothing to do with the common good. It's very much about individual rights. You have no right to pollute in my backyard (including the air I breathe), just as you have no right to punch me in the face or give me brain damage with lead petrol usage. It's a justified use of government force to stop you if for some reason you think you are entitled to violate my rights.

  "moralizing zealots"

But I agree there's an elitism and power game aspect to it that I find revolting. Emotionally, I really want to put my middle finger up and take the compete opposite position just to spite the virtue signalling snobs. Rationally, though, it seems to be a real problem that we need to solve as a species, irrespective of how self-righteous and smug some of the activists are.