Sometimes it does pay to read an article before passing judgement:
The cause of the cracks in the Nancy Bird-Walton's wing is still to be determined but an initial assessment is believed to pin the blame more on the way the wing ribs were constructed rather than due to the loads and thrust at which the aircraft was operated by Qantas.
Manufacturing error is of course no small matter, but it's quite a lot less hassle to rectify than a design flaw.