It is true that news can affect people's emotions and therefore lead to price fluctuations. The right decision must be made by the mind, so we need to have our own point of view and not be distracted by some news.
Actually there is an assumption that all those who are in the market are rational and this requires them to keep aside the stupidity and emotions while dealing in the market. Of course it affects the market and this is something that shows big effect on aggregate level.
But this can also be avoided by constantly analyzing the market and doing the cost benefit analysis before starting trading or selling your coin. This raises the prospect of profit in future.