One reason why people trade by emotions (blind) is because of influence which also comes from a blind trader... There's a saying that "Empty Vessels Makes the Loudest Noise"..
Its such a funny thing to see a situation whereby one blind man will be showing other blinds the way to go, you must know who is mentoring you and their competencies in trading, also, we don't have to depend on everything by those that are teaching us, its a challenge we can also take up and learn in other to know what is expected of us to do even without the influence of those that are mentoring us, but we are learning on how to be independent, which is why it is more of a necessity everyone of us must know what we are doing and be independent on it without always been independent.