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.
Check your wheel balance. Have a tire shop check and rebalance your wheels. An off balance wheel can cause lots of vibration. This is a cheap fix if it's your problem. Replace your shock absorbers or struts. Worn struts or shocks can cause an uneven driving condition and can result in shaking, porpoising or bouncy ride.