Greed may even destroy bitcoins most praised quality, its planned scarcity. I don't see what could prevent that.
It's painfully obvious that you are not an economist. An economist always asks "as compared to what?" Is Bitcoin more vulnerable to exploitation from the greedy than say U.S. Dollars? I would argue that the answer is obviously "no" but you haven't even considered the question.
I imagine you think "well, but dollar supply is managed by central bank professionals who act selflessly". as if banksters aren't subject to the same human frailties as everybody else. I trust selfish people to act selfishly more than I trust selfless people to act selflessly. From an economic perspective, I see it as a matter of incentives.
Bitcoin doesn't need central bankers because it has day traders and investors who have a stronger incentive to inject and withdraw liquidity at the right moment than Janet Yellen has to do the same at the Fed.
"It is no crime to be ignorant of economics, which is, after all, a specialized discipline and one that most people consider to be a 'dismal science.' But it is totally irresponsible to have a loud and vociferous opinion on economic subjects while remaining in this state of ignorance." ~ Murray Rothbard