Honestly as someone who isn't American, this is more important to me than economic policy or whatever. I want Biden to win, Trump winning would be awful for everyone, basically worldwide. But most of all I want the kids to stop dying. I really don't think this is so unreasonable.
Trump won't be convinced. Biden might be. And this "less important" issue could still cost him swing states. I think maybe not supporting a genocide could be a vote winner.