I don't think they're all evil either BUT the level of greed in just a few individuals can have catastropic affects on surrounding markets and entire macro economies. I'll cite Enron for energy, Worldcomm for telecom, Pfizer for medical, Bear Sterns for mortgage lending, Arthur Andersen for accounting. I'd add MorganStanley for petroleum but there seem to be enough distractions to continue to leverage more futures w/out the assests to back them up that it doesn't seem like fingers will point to until the bubble bursts before this can prolly go on the list.
I think fear and greed are THE two most prevailing factors driving our economy and way of life, far out weighing supply and demand. It effects us as individuals in how much we consume, hoard and waste. We use it to justify any questionable, unethical or even illegal practice in business.
I don't think it's so much corruption and back stabbing as it is ass covering and self interest.