Folk Zen: The wise man said, "It can't be done." The fool came and did it.
Many obstacles are all about perception. Although we strive to educate and inform ourselves as much as possible in our areas of expertise, we do not claim to be the smartest or most informed. We certainly wouldn't want a fool to come around and make us look stupid.
When we work on a project, we always seek the simplest and most unobstructed route to accomplish the goals. It would take a lot for us to say if something can't be done. It would take even more for a fool to come and make us look even more foolish.