My first point of reaction is always from logic, I try to get as much Information as I can gather in a reasonable amount of time and make decisions based on fact and figure.
Well that should be everyone's concern, decision should be based from logic by looking at the facts and figures, however, human natures dictates that most of the time, people tend to be emotionally involved and as a result, we can't make the right judgement in reasonable amount of time.
FOMO and FUD goes hands to hands. You cant control both at the same time, if one perishes then other will exists and vice versa.
Yes, they are part and parcel of this ecosystem. They goes hand to hand. For a average traders, its really hard to distinguish and fight them, unless you learn everything from experienced but it take years to be a seasoned trader.