It's a little like casting out hundreds of fishing lines into the audience. You start getting little bites, then more, then you hook a few, then more. Then you can start reeling them in and that's a loveliest feeling - the whole audience laughing with you.
To accuse others for one's own misfortunes is a sign of want of education. To accuse oneself shows that one's education has begun. To accuse neither oneself nor others shows that one's education is complete.