Going that extra mile was necessary to make this a big story instead of having it brushed under the carpet. It seems that the leak was known about as much as a year ago (http://www.nzherald.co.nz/nz/news/article.cfm?c_id=1&obj...), MSD were informed, but nothing was done because there was no media firestorm. By showing what was exposed, Keith Ng made the horrific impact of the leak understandable to the public and media and greatly increased the likelihood that something will get done.