Ok, Here's some info on tire balance. Lets keep it simple. If a tire is to heavy in one area that has to mean that it was to light on another area. Lets just assume that a tire is to heavy in one spot and that spot is in the center of the tire tread close to the surface. That's a static imbalance and the tire will bounce up and down as the heavy spot rotates. More then less pressure will be exerted on the tire as it rotates. That bouncing up and down will cause accelerated wear at the heavy spot because of gravity and centrifugal force. Now lets move the heavy spot to the edge of the tire. That's called dynamic imbalance. Now the tire will not only move up and down but it will move side to side. It moves side to side an amount depending on wheel bearing play, tire flexing and steering/suspension wear. That will also create tire wear. I can't remember the exact term to describe that type of tire wear. When tires are out of balance they are probably always a combination of static and dynamic imbalances. Proper computer balancing and placement of the weights will correct those imbalances.
Weak/worn shocks will also cause tire wear. The tire continues to bounce when a bump is encountered because the bounce is not dampened by the shock. When I say bounce it does not really come off the ground. When you hit a bump first you get increased pressure then less pressure as the suspension, tires, wheels and unit rises up. Yes tire imbalance can and does accelerate tire cord damage by increasing bouncing forces and tire flexing.
TeJay