In my humble opinion i think we or steemit can not stop the war from the greeds. However we can control it, for example having down vote option and the downvoting power is base on SP. In short a greedy whale who get to earn 200 SBD but got devote by other whale by -150 SBD (or could be more but never higher than the actual earning) he only get back 50 SBD, which could be less ROI for the greed. Let the whales fight the whales.
Like you said about human nature, before helping someone they have to be able to help themself first, some might take more on helping themself than helping anybody.
Good point indeed however how many whales have the will power to take on the abuser? or are most part of it?