Emotions are part of the cryptocurrency market but they don't overwhelm the investors' decisions.
The fact that makes an impact on investors emotion is news and during the last year, the worst part is that fake news is getting more and more attention and it escalates rapidly.
And people can't determine which is fake or not because they let their emotions take the wheel instead of being more critical about any news they follow. A coin's demand and supply also largely depends on how it presents itself and it's projects. Good coins create big demands because investors who look at the future believe they'll have real actual use.
And that should be the real case by now. The actual usage and not just an imaginary one which have 50/50 chance that wont happen.
I remember one scam ICO that happened and it is really in hype. Emotions took over, demands sky rockets and people are following it until it blows to just an imaginary project.
This kind of things in crypto currencies should be prevented. I mean, we can prevent it and look for a project with a company already or a real product in the market.