Alignments are only as good as the shop doing them. If the shop does shoddy work, your alignment probably will not be correct, leading to these situations.
One problem with alignments is if you hit a severe enough pothole, or a curb, or bash a roch or something, it can knock your alignment out, causing tire wear, poor drivability, etc. Fr this reason, I think you've got an uphill battle with your dealer,because you cannot prove 100% that it was thier alignment and nothing you did to cause the alignment to go out. The only thing you may have is if it's stiputaled in a contract that your alignment is covered for xxx amount of time or miles, then there probbly is no recourse you have.
And, as far as tires wearing out quickly due to non-alignment issues, what kinds of driving do you do? The Touareg is made to handle very well, and as such, spirited driving can spontaneously occur. The problem is controlling 5000+ pounds of mass on tires made for gripping the road. Sure, you could put the hardest tires around on there and get better life, but they would probably slide/squirm all over the place and make the driving experience suck.
Do a search on here, there are some people that have had tire issues in the past, and some that haven't. I'm in the latter category, with the stock Dunlops about 3/4 used up at 23,500 miles. Other than some minor tread chunking from some light off-roading, no big deal. The dealer did my alignment at 2,000 miles, and I'll have another one done when I get new tires. I don't consider myself easy on a car, and prescribe to the spirited driving style more often than not. This, along with being in-town, explains why I need brakes now
My advice: Don't be part of lawsuit-happy America. Suck it up, revel in the fact that you have an exceptional SUV that will out-handle about any other on the road, and throw some new shoes on it with a treadlife warranty. And, if your alignment is an issue, go to another dealer (or independent shop) that's got a better service/alignment deppartment, get it fixed, and enjoy the ride. Life's too short and complicated as it is, why make it even more stressful.
PS-I don't work for VW, which I know will be coming.
Good luck,
Matt