So Tory education secretary Michael Gove wants all children to wear a blazer (scroll down), on the basis that 48 out of 50 of the best state comprehensives enforce the wearing of a blazer.
Here's a similar idea: being in Who's Who is probably a fair indicator of success. So why don't we simply list everyone in Who's Who, and then everyone will be successful?
Or how about: the presence of condoms in the home indicates a low(er) rate of STI infection. So why don't we mail all those pesky Catholics a free box of Durex?
Something in the inverse: imagine you are in charge of safety at a nuclear power station. Your sole job is to watch a "DANGER OF MELTDOWN IMMINENT" indicator light and act on it. If the light ever lights up, do you:
a) investigate the problem using all the other monitoring equipment, determine that there is a serious fault, evacuate the building, press the "emergency shutdown" button, and later begin an investigation into the problem or,
b) disconnect the light.