it seems that the media that publish negative news to bitcoin is a medium that works with banks that still use the traditional banking system. they are afraid their system will be replaced by blockchain so as to bring negative news continuously
Yes this is the case. The banks work with the media to dissuade use of cryptocurrency by telling people that is is risky investment in hopes of preventing people from using cryptocurrency. Banks are even creating their own cryptocurrencies. Widespread use of cryptocurrency also have negative impact to retail stores as companies will allow consumers to buy directly from them.
When you hear people warning about the use if cryptocurrency, they are really against it because it has negative impact in their business.