Thin-wall construction, like on large-tube Cannondales and Kleins, is a method whereby the increase in diameter (with no increase in the amount of metal used) produces a tube which is much less likely to bend. Of course, this does nothing for side-impact strength. Be assured that the tube wall isn't going to buckle, except in unusaul situations, like a crash. If it did, the framebuilders would go out of business.
Having said that, if you do bend a thin-wall frame, you are probably S.O.L.. The cost of repairing such a frame is likely more than the replacement cost.