Greed can be a motivator for doing illegal and/or unethical actions. There is no doubt about that. However, greed is also one of the most powerful motivators for good.
Friedman sums it up perfectly in this clip:
http://www.youtube.com/watch?v=RWsx1X8PV_A
For those who many be new to bitcoins and/or unfamiliar with economics on a whole, I encourage you to at least watch some interviews and speeches given by Milton Friedman. If you have the time, start devouring all of his writings as well.
Greed is the destroyer of civilizations.
Another whole scam that goes on in these ideologies is supplanting the word 'greed' with something which it is not. Rational self interest =/= greed. This is absurd. Yet, of course, always, the nature of synthetic ideological systems is to attack language and this is no exception.