Some people use bitcoin to buy illegal stuff, the majority of people use bitcoin on legal things.
Some people use paper cash to buy illegal stuff, the majority people use paper cash on legal things.
Bitcoin is just a currency. How it is used is a different story.
In this piece, bitcoin being a currency and it being used to buy illegal stuff seem like the same story:
http://www.dw.com/en/bitcoin-paying-with-the-cryptocurrency/av-37536803i will say that bitcoin is like a knife which have many function but its depend on us, what we want to do with the bitcoin and what we expected from bitcoin. but i think we don't have to use bitcoin for illegal thing because if we do this, then people in out there will be thinking that bitcoin is only for illegal thing and they will stay away from bitcon. i am agree that bitcoin is currency and for now its available on internet but in future, maybe we can see that bitcoin is available in real life too.