Often when I see someone accusing people of voting against their own interests, it’s pretty clear that the person making the accusation has not taken the time to understand the values others are basing their choice on.
If I could rob a person and be confident that I would never be caught and punished for doing so, am I acting against my own self interest if I chose not to rob them because it goes against my moral code? No, of course not. But based on the way some people talk about voting against ones self interest, you might think I just cheated myself out of free money. Is it possible that a person might “vote against their own interests” because of a misinformed view? of course, but you’ll never understand a person’s motivations by chosing to paint them with broad strokes based on your prejudices instead of getting to know them individually and trying to understand what it is they truly value.