Look if your players can't get together on a popup, it is 100% coaching. Obviously the players are baseball stupid and never learned it, but still it is the responsibility of the coaches to teach it to them. For some reason we as a franchise seem to have decided to cede the development of our players to the players themselves, but this isn't how successful organizations run. There is a reason you see the Sox making the same mistakes over and over again, while other franchises don't.