Tires can be a trigger for DW, but they aren't the source of DW.
If you have bad ball joints, a loose trackbar, bad tie-rod and drag link ends, etc., bad tires will cause vibrations that trigger these actual sources of DW.
If you simply fix the tire balance problem but still have the other parts worn or loose, the DW will come back once another trigger comes up--i.e. driving across railroad tracks, bridge seams, etc.
Sorry, but I just have to add another few cents to the fire.
I'm not sure what you're saying here is not somewhat, well, I'm not sure what the proper term is. "Self-cancelling" maybe? If they aren't the source, how can they be the trigger?
Basically, why can't a "trigger" also be the "source"? At least in some cases?
My answer? It can. And often is.
Otherwise, why doesn't a loose trackbar ALWAYS cause a DW? Why don't bad ball-joints ALWAYS cause a DW? Because, by themselves, they can't. They need that oscillating trigger from the tires. Therefore, the other components are not actually the cause. Just a contributing factor.
On many vehicles that see DW's happen, a loose steering component just can't create the proper conditions, all by itself, for the full-blown DW's to occur, until a tire gives it that extra push.
Ergo, the TIRE is the actual problem. Cause, trigger, whatever you want to call it.
By the same token, a tire alone can cause the DW's all by itself. Even if every single component in the steering and suspension is brand new and properly sized and torqued, a bad tire (internal damage mostly) can and will overcome all the other components, even the power steering gearbox, and whip that steering wheel almost right out of your hands.
Been there, experienced that.
And, so it seems, did johnnydenim. Everything on his, except for the ball joints, was brand new or checked. And it still wobbled or shimmied, or whatever his symptoms were, until the new tires were installed.
Even after most of the other components were changed/fixed.
Not saying he didn't need those pieces, as they could have been worn by age and mileage and use already. And, like you've mentioned, a good wobble can take out an otherwise perfectly good component like a wheel bearing or ball-joint. But those other things aside, it seems that the tire was the actual root cause in his case too.
Sorry if I come across all smart-alecky or preachy (I know I can, but it's well meant(?)), but in spite of appearances I do welcome new knowledge and value other's experiences too. I like to add them to my own memory bank, so blaze away please at what I've said if you don't agree. Because I know as well as anyone that esch vehicle and set of circumstances can be completely different. And more of my experiences with it really have been with non-Jeep vehicles. Seen enough with Jeeps too of course, but my first few, and many since then, have been with other cars and trucks.
I'm just seeing a trend here that more and more often, whether in the case of TJ's, or JK's, or even YJ's, that the tires are still playing a key role in a case of Death Wobble as often as not. So for the sake of saving time, money and aggravation by someone who's just experiencing a DW for the first time, I don't want to ignore them as a key player, if that's what they are.