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 not a new things anymore. If you can see, there are already cases like that that involve fiat money. As of now, it would be easier to use bitcoin as payment for these illegal drugs because the transfer of bitcoin is just one click away and there will be no traces whether where it came from,