From recent news in India it is heard that bitcoins are used to sell drugs..I know its a currency and it is also used as a normal money... but these can create a bad space in people's mind that bitcoins are used to sell drugs..so they will not use bitcoins... Conclusion is that BTC is also a currency which is having a high value in the market..and bitcoins must not be used in these illegal activity which can reduce its usage and value.
This is true in some cases since bitcoin as we all know it, offers the users complete anonymity over peekers on the internet. However, I think criminality that involves bitcoin is far more lesser than the amount of crimes commited using fiat currency. I think this should clarify doubts and fears as well as hatred on the said cryptocurrency.