Well, there's ignorance, and there's ignorance.

Displays of ignorance should be avoided at all costs. Ignorance implies that you do not know anything, you should know it, and you are a blithering idiot for not knowing it. Those who openly exhibit their ignorance should realize that there is a good chance they will be ignored, derided, or confused with George W. Bush.

Common, run-of-the-mill ignorance is a far less serious offense. It is often possible to use one's ignorance as a platform for launching truly brilliant examples of obfuscation, circumlocution and plain old-fashioned bullshit. I believe it was the great philosopher Microcephaleze who said, "Ignorance is one of the founts from which high quality BS doth flow. The other two are beer and forgetting to take one's medication."