Bitcoin alone holds itself in a strong position in the long term. Altcoins can't hold their position in that way for long. Bitcoin can return to its maximum ATH at any time. People often fall into a state of confusion during ICO. They are confused with attractive white papers. People buy these coins hoping to make more profit and face losses. They steal huge amount of money by tricking common people. Bitcoin Pow is fair and realistic where miners do what is best for the network. Finally let me say that Bitcoin is a completely decentralized institution and completely different and risk free from other coins.
You are confusing confusion with greed. It is not because people are confused that they try to grab money via an ICO investment. It is because they are greedy to the point that they are willing to give up on their value positions, aka BTC. They tell themselves that it's only for a short period of time to flip the money for the better, but in most cases it is going wrong. Some get lucky of course, but those lucky guys shouldn't be taken as a precedent for others to do the same.
I believe not. OR not entirely. "Greed" is only part of the reason, but that's the wrong word to use in my personal opinion. It's because it's in our nature as humans to feel the need to be incentivized, therefore we have an urge to GAMBLE. Plus from the a normie's viewpoint, our investments in Bitcoin is a gamble on a "Ponzi Scheme" caused by greed. Haha.
¯\_(ツ)_/¯