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 agree people are always quick to run bitcoin down, by saying its used by criminals but that is because they haven't thought about it, like yo said cash is even more used by criminals and i dont here the calls for it to be banned....... oh wait, yeah i do ..... the cash wars have started.