We will agree to disagree on this one. IMO it is what makes the world go around anyways so I believe it's all part of what makes up a market and a currency and in a way creates legitimacy. How much fiat currency is black market money, I'd be guessing a lot.
There is a lot more acceptance in BTC and some other Cryptos, once it becomes mainstream where you can go to every pub and use cryptos to purchase beer etc then we I am sure we would then see a lot of this problem dissipate because it will create mass dispersion and will allow some of these bigger guys to start selling off their hoards rather than transferring them to one another for goods. That is why the mainstream legitimate exchanges, investment companies have been buying it, in hope that it will become mainstream and create dispersion.
https://news.bitcoin.com/bitcoin-use-darknet-markets/
Anyways its good to have a difference of opinions as that is what creates a market and what creates liquidity, if everyone thought the same thing then there would be no liquidity.
You are right though, the volume of coin looks to be tapering off the markets
