I see your point. I look at it more as creating a system that is resistant to abuse by design. It is a similar problem that democracy is having now. We could just have a king /dictator (centralized) that could make sure everything runs smoothly, the problem is that as soon as the king goes rouge there is not much you can do to stop them. Where a decentralization of power is more resistant to corruption but the system has to be designed very carefully to make it last as long as possible. I will say that steem is one of the best examples I have seen but there are still some loopholes that need tightening as you pointed out.