People voting against their own best interest . . .
This is a legitimate concern and something that everyone should be talking about and trying to figure out. It doesn't seem sane. I would even argue that it is not sane, unless it's in the rare case where voting against my own best interest is, in fact, in the interest of the greater good - e.g. I haven't driven in some neighborhoods in years but I realize that many (maybe most) people do drive in those neighborhoods daily, so I will give up ordering a pizza once a week and contribute the pizza money to higher taxes to keep the roads in those neighborhoods in good repair.
But it doesn't make sense for women to vote for politicians who want to pay them less than males doing the same job and who want to control their reproductive choices and who protect pussy grabbers and attempted rapists, or for minorities to vote for racists, or for people who say they love the United States of America to vote for fascists who want to destroy the government, or for people who are hungry and cold and sick to vote for Republicans who want to deprive them of livable wages, food, heat, and healthcare. None of that makes sense. None of that seems sane.
Even more baffling than people who vote for Republicans who will do everything possible to make life miserable for as many people as they can, though, are the people who bitch about them and do the exact same thing when they support media, groups, and businesses that funnel money to those Republicans who will do everything possible to make life miserable for as many people as they can. They use their time/money to vote against their own best interest, too. And they look like hypocrites (because they are) when they criticize the other side for things that they also do.
Let's all vote - in elections and in every day life with our time and money and words - to protect our best interests.