It's called physics. The offset fixed barrier crash would simulate maybe you falling asleep and drifting into a solid object. This is not a typical real world crash. Pit your car with my truck (3/4 ton by the way, not a 1/2 ton as pictured), and we would both likely end up walking away unscathed. You due to the higher quality engineering, and me due to the heavier mass absorbing MUCH less of the impact.