The theory was formulated in the 1960s and 1970s as new information was obtained about the nature of the ocean floor, Earth's ancient magnetism, the distribution of volcanoes and earthquakes, the flow of heat from Earth's interior, and the worldwide distribution of plant and animal fossils.
The fact is loose control arm or track bar bushings can contribute to death wobble. Bent, or loose bolts, wallowed out mounting holes, and bent control arms can also contribute to your Jeep catching the shakes. To prevent this, keep an eye on your control arms and track bar.
YES - A broken tread or side belt will cause a shimmy or shake while driving. Also another way of telling if you have a belt shift is look directly at the tread face. If its broke the tread will actually be S shaped... hence the term S Shaped Tread. If you notice a belt shift replace the tire.