They don't know that. The percent doesn't matter, the concept of greed has to do with the desire for excess.
Last time I checked we classified animals as creatures acting upon their instincts not making conscious decisions. Desire is a "Conscious" thing iyam. Doesn't really fit in with the animals, Either it's instinct or they are making "Conscious" decisions.
However, when deceiving and cheating people becomes a dominant behavior, that elicits a negative feedback loop, then it truly does become more destructive than instructive.
I think we are currently living in this "deceiving and cheating" world.