Once you can laugh at your own weaknesses, you can move forward. Comedy breakes down walls. It opens up people. If you're good, you can fill up those openings with something positive. Maybe... combat some of the ugliness in the world.
I'm more than ever of the opinion that a decent human existence is possible today only on the fringes of society, where one then runs the risk of starving or being stoned to death. In these circumstances, a sense of humor is a great help.