Why is persisting in idiocy admirable? I'd rather politicians corrected their mistakes

All very well if those politicians have the willingness and capacity to recognise and acknowledge their mistakes, Richard.

Sadly, The Beast of Grantham didn't appear to have either of those fine attributes. What she did have, however, was courage and determination. Imagine what could be achieved by someone with those attributes who chose to direct their energies equitably, and without the vindictiveness and viciousness so apparent during her awful Prime-Ministership.