If you check up on it, you'd see that the seal never takes any real load.

From an engineering analysis point of view:

The load (a force generated by the car's weight while subjected to lateral g's) is transmitted through the outer axle housing tube to the bearing's outer race. The outer race transfers the load through the balls (or rollers) to the inner race, which transfers the load to the axle shaft onto which it is pressed. The axle shaft transmits the load to the hub plate (or rotor plate if you have rear discs) which then transfers the load to the wheel, which transfers the load to to the tire. The tire has to resist that load (the lateral force) while not skidding.

The seal is not in the load path.

Bring a six pack if you want to see it. Extra credit if you notice that the load is in the same direction as the load used to press the bearing in place.

The harder the car corners, the harder the axle is "pressed" into the bearing. (Or vice-versa.)

The lateral loads are NOT shared equally by the bearings on both sides. Because of body roll, the lion's share of the load goes to the outside wheel ... the one trying to push the axle harder into the bearing. In order to pull the axle out of the bearing, the load on that axle has to exceed the press load. What usually happens is that one of the shoulders holding the balls or rollers in place fail from fatigue, usually caused by eccentircity or vibration-driven problems.

The 1964-1969 Seal:



The Later Seal: