content: Honestly, fiat currencies are more heavily used for illegal purposes than bitcoin.  Bitcoin is used only when you want to do said activities at a distance because it's the most secure way to do so.  There is a lot more money to be earned from fiat currencies on the scam front, as well, because the main target of most modern scams are older people who barely understand email, let alone bitcoin.  Secure communications will always be useful for criminals and the sort, but equally useful for people who have legitimate uses.