Bad news from untrusted media could bring bad impact into the market because of many people just easily trust the media without search for themself the truth. It definitely could affect market when people just being ignorant for the truth and accept all of news.
Yes humans will control the development and falling of cryptocurrencies they are responsible for all the things and the changes in cryptocurrency if they move to the wrong direction then all are going to be the end from cryptocurrencies it is not only suitable for bitcoin and also some other investment in world in cryptocurrencies.