There have been articles on how hackers and other terrorist support their initiatives with Bitcoin. I believe you have also come across a few of such articles. But the question is, does that mean we should ban Bitcoin?
In my opinion, the answer is 'no'. Just as the internet, it has its good side and the bad side but the good side always overrides the bad side. Bitcoin is just a medium of exchange which can be used by everyone on the internet. It is serving its purpose as a cryptocurrency.
What do you think?