Scott Berkun, Project Management consultant and author of the book "The Art of Project Management" asks the question: Why do smart people defend bad ideas?
"Part of being a truly smart person is to know which level is the right one at a given time. For example, if you are skidding out of control at 95 mph in your broken down Winnebago on an ice covered interstate, when a semi-truck filled with both poorly packaged fireworks and loosely bundled spark plugs slams on its brakes, it's not the right time to discuss with your passengers where y'all would like to stop for dinner. But as ridiculous as this scenario sounds, it happens all the time. People worry about the wrong thing at the wrong time and apply their intelligence in ways that doesn't serve the greater good of what they're trying to achieve."
Worth a read.
ChangeThis :: Why Smart People Defend Bad Ideas