...is because it's been nailed there.
"The most common error in politics is sticking to the carcasses of dead policies."
- attributed to Lord Salisbury, 1877
“No one starts a war--or rather, no one in his senses ought to do so--without first being clear in his mind what he intends to achieve by that war and how he intends to conduct it.” - attributed to Carl von Clausewitz
Dieppe, anyone?