As a Moyes supporter, I hesitate to disagree with you, but I do. I think everyone is entitled to have a strong view over who, and who isn't, appointed. Once somebody gets the job, however, it's our job to support him as best we can. If things don't work out after a reasonable time, by all means criticise, but you don't get divorced on a whim, and so you can't immediately hate your manager on the same basis.
Pol Pot, Hitler, Stalin, and the Devil, I wouldn't accept, but everyone else, even appointed against my strong feelings, I can get behind.
(Not sure that 'get behind' was a term immune from smutty misinterpretation, but I'll go with it in the hope everyone has their minds on a higher plane).