At least once a year, a movie comes along that makes everyone question why it even needed to exist in the first place. Keira Knightley felt the same way in 2004, and she was in it, which doesn’t mean she was wrong. In fact, she was bang on, because everyone else felt the same way. You’ve got to wonder what goes on in those Hollywood boardrooms, because audiences have a funny way of sniffing out a purposeless picture from a mile off. Take 2026, f…