How come when a football team loses, the first few people to blame are the quarter back and the lineman?

It is all most impossible to win a football game without your quarterback and lineman this is true, But if you can not run the ball with your running back or full backs you don't have part of your offense, and if you can not throw the football with your quarterback or your ends and wide receivers cant catch the ball then you lost your other part of your offense. Football isn't all about offense any way, you have your defense to help you, if your offense is good and your defense cant stop the opposing team then you don't have a good chance of winning the game. There are other factors to football like the special teams and what not. But blaming the lineman and the quarterback when you lose a game, will not do anything to make your team better. So if the next time you lose a game think about how you can do better and it will make you better as a team.