“It’s not fair, this life,” mumbles a bloodied Kevin Costner, our brooding anti-hero, who — hang on — is wearing a gilet. This is, in fact, not the O.K. Corral, but a multi-car pile-up on a hard shoulder involving a yellow JCB digger. And, ah, Costner is now shooting that horse in the face with a handgun. Mustang, sadly.