bitcoin like a fiat currency can be good or bad depends on how it is being used, it can be very good tool if been used to help the needy or the provide the needs of one's family but can be bad if been used to buy drugs and been used to finance those terrorist acts.
Of course Bitcoin can be used for good but some people think that if you make use of Bitcoin you are automatically a criminal.
That is not true because there are so many people that use Bitcoin just to make some extra money with it.