Because you need a run game to help support your pass game (vice versa is true too).. You may also need a run game to bleed clock and close out the game
At the end of the day, you just have to be able to move the ball consistently. Sometimes the other team is comprised in a way where that means passing it all night, sometimes it's the opposite. I'm a RTDB guy, but against Miami it just wasn't happening with enough consistency. When we needed a first down, after stopping them on 4th, we picked up one on the ground that allowed us to bleed the clock down to under a minute. That was huge.
