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It would be completely absurd to not think that a massive part of Bitcoin's popularity is its ability to purchase and sell drugs online. I am referring to the system, not Vinnik's case

Most drug dealers use cash. So should anyone who uses cash be arrested?

Arrested? I don't remember saying anything about arrests. Illicit fiat cash is more difficult to launder with large amounts. That's what's attractive about Bitcoin.

I personally don't care about drugs. I do care about fraud, ransoms and human trafficking though. Legitimizing cryptocurrency exchanges is a good thing.