Leaded avgas is coming from piston-engine aircraft, and I don't think that was really what OP was talking about when commenting about the people flying private aircraft while publicly demanding people stop driving pickup trucks.

For leaded gas, we can simply ban the leaded gas, as the cost of performance in piston-engine aircraft. I'm not really an expert, but at a first glance I see no particularly compelling reason not to do it, so I'm not opposed to that at all.