My neighbor said one flight a year is 'no big deal' and I honestly don't know how to feel about it

Building on the point about shaming people for visiting family, that part really sticks with me. My cousin moved to Seattle and now she flies home for every holiday, and if someone told her she was a bad person for that, she would just dig in and stop listening. But here is where I would take it further: the folks who fly once a year and feel fine about it are often the same ones who could push hardest for better trains and cleaner planes, because they still care. If we write them off as hypocrites, we lose them. So maybe the move is not guilt at all. It is asking Dave to vote and speak up for stuff that makes his one flight less harmful, then letting him off the hook enough that he actually does it. That feels way more useful than a fight in the driveway.