What the hell are you talking about? How is it remotely controversial to say that Bitcoin is used for illegal purposes? Have you ever heard of the dark web?
Bitcoin is being used for illegal purposes. Ramen is used for illegal purposes.
Ban ramen, Bitcoin, prison yogurt, barter, USD.
Bitcoin is significantly easier to track than cash or Ramen. If you want to get rid of illegal Bitcoin transactions you simply need the government to care. But the real risk is the ramen/USD trade, that can't be tracked. Ban Ramen?
Right...