If government decisions are overturned for Wednesbury irrationality and Wednesbury irrationality requires that no sane person could have arrived at the decision, does the court imply that the government is run by insane persons?
http://www.uniset.ca/other/cs6/2001EWCACiv789.html is a good example of a case where a government decision was overturned on Wednesbury irrationality grounds. (Ctrl-f for "judgment of the court" and start reading there)