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.
Some othe people they dont find a good job to sustain their needs they used bitcoin to approach other people and they started doing bad things, like scam. They used bitcoin in illegal way to get more money to other people.