Yes, Don Quijote attacked windmills and was dillusional. But was he really mad? Don't people today decieve themselves that money will make them happy, or that they can live however they want without consequences? So yes, Don Quijote is a bit extreme. But is he really deceiving himself any more than modern day people, who strive to reach an unobtainable goal or chose to ignore reality? I'm not so sure that Don Quijote crazier than the average person.