Because bitcoin fails to deliver the highest expectation of new investors. With their rumors,it reached out the palace of media and in the kingdom of government, forcing them to declare bitcoin is a scam and spreading FUD with the trembles feeling in their spirit that bitcoin is a threat for the growth of economy.
Lack of understanding about the use of bitcoin due to the emotional investors will lead to war against it. But the more this things is happening the more bitcoin will become famous and leading all the crypto currencies outside from misunderstanding of each individual mind into fullest illumination, seeing how this system is greater than the Old one.