Humor has historically been tied to the mores of the day. The Yellow Kid was predicated on what people thought was funny about the immigrant Irish. When you're different in a society you're funny.
I feel there's a power in theatre but it's an indirect power. It's like the relationship of the sleeper to the unconscious. You discover things you can't afford to countenance in waking life. You can forget them remember them a day later or not have any idea what they are about.