JSA Sanctions not working

Re Fri, 4 April 2014 story at http://www.rightsnet.org.uk/news/story/government-backtracks-on-promise-for-second-independent-review-of-sanctions Dame Anne Begg MP also said,

“The number of JSA Sanctions are at a 12 month high, and probably the highest ever on record. Yet, we don’t even know if these Sanctions are working. There have been many examples of people being sanctioned and not knowing why. If the aim of a sanction is to change peoples’ behaviour then people need to know why their benefits have been stopped otherwise it is just a punitive punishment which is trying and save money.”

- Dame Anne Begg MP, Aberdeen South MP, Fri, 4 April 2014 MPs Press Release

Why has it taken so long for an MP to state the obvious?