Insanity is relative. What one person considers insane, another might consider as brilliance. When Leonardo Di Vinci lived, people thought he was crazy for his ideas of a flying machine. And if it weren't for his designs of one, the Wright brothers would have never made their own. They were also considered crazy. But now we've got airplanes due to their brilliance. People thought Elvis was perverse and blasphemous, but he revolutionized music... something you probably know nothing about, actually.
Point is this, people who are considered crazy might make an impact on the world in a way that makes the world better.