It is because they are fucking idiots with maintaining their vehicles, and modifying with mall crawler shit. On the Jeep in the video, there are two main contributing parts. the track bar =/= steering bar. And the steering damper is weak as fuck.
What happens is people put on their shitty ass lift and don't tighten things down using lock nuts to the required torque, and don't upgrade their dampers. be it a Heep, or a 250. Having the track bar not be the exact same lift and angle as the steering bar will help induce it as well (this is also what causes bump steer, which can induce the wobble). Jeeps are notorious for this issue, their bars on a lot of models are not the same length, the 250 with even the cheap lifts do a good job of maintaining proper angle, and are proper length from the factory.
Same thing with death wobble on bikes. There is a certain amount of trail vs weight balance you need to maintain on a bike, and tight bolts. harley's get it from the rear swingarm being loose after a job chroming something up that involved removing the swing arm and shit wasn't tightened down right, sprortsbikes from trying to lighten the front end with a slightly smaller front tire that makes their rake therefore trail smaller. And choppers from not having enough weight on the front end of the bike (also on some cruisers). Plus, of course, other worn out parts , low fork fluid, worn tires, worn bushings and bearings in the triple tree (my bike got it from trashed triple tree bearings, so much so that all I had to do was let go of the handles and it would start the wobble)
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