I think it is very normal, the world is freedom and competitive that everyone need to work hard to get what they want, you are free to get greedy and fearful as you want, the world is a machine that need to be running continuously without a pause, then the earth is stronger.
well yes i think, people must be wise in order to survive in these society full of selfishness. being greedy in the way that you take the opportunity to get advance before the other, just like in bitcoin, being wise to start and continue working to earn bitcoin. being greedy in a nice and good way.