Well, that is a whole lot true and until people actually learn from the mistakes that comes with greed before they will be able to know how to handle themselves, and that is if they actually let go of that greed. I believe excitement, greed and ignorance tend to work a whole lot together. Sure, the media are always there to create the hype and excitements which brings about FOMO and then a lot of promises assumed in people's head, and the only way to be able to handle yourself without having to miss out on any possibilities on the way up and on the way down by monitoring possibilities of trend change is by seeking knowledge which helps eliminate the ignorance and greed from the picture.
Yes people become greed if they see the market in good position. It is the human nature that he wants more and more but in some case people acquire good benefit and some case it will not be profitable. So people lost their thinking in greed and make mistake by hurry up during transactions. They are not studying the market correctly and making some wrong decision in the greed of huge profit.