Ever heard the expression, "tears of a clown"? People use it to describe someone who wants people to think he or she is really fun and happy, when in fact they're down in the dumps. The joker seems kind of like that. At the start of the song, he is looking for a way out of some bad situation (maybe even his life). He's totally dissatisfied with the "confusion" around him and with the ignorance of the businessmen and farmers. Come to think of it, maybe he dislikes these two kinds of people because they seem to be enjoying life while he can't. Truth be told, we don't know what exactly is bugging the joker; it's a vague dissatisfaction.
Because this is a rock and roll song, we have decided not to write possible academic arguments, as it seems to detract from the heart and soul of the song. Please let us know if you disagree!