It is actually a fallacy, there are often good politicians. In our (Australian) system they are usually independents. like any evolutionary process, the enemy must be confronted to be successful. Our party politics (about equally based conservative and liberal) makes it particularly hard to compete as an independent for votes against those of the parties which have mega dollars, so when one makes it through they often become very powerful, because they often hold the balance of power. So I think many of your comments are naive. However in systems where the major party is supported by multinational commerce whose interests are purely the return to the shareholder, the Democratic process often fails as it is unrepresentative of the people instead be the front end of corporate industry. The end goals are definitely NOT the same.
Cheers
He was just joking basically, not meaning that in truth there are no good politicians.
And i was just explaining the joke.