True, but that doesn't necessarily mean they will. One of the smarter things about Silk Road in my view was the nominal policy of disallowing trade in child pornography, criminal services, stolen credit card data and so on, ie illicit things that also have (or are intended to have) victims who are necessarily injured as a condition of production. There's no economic tipping point at which the consumption of child pornography could justify the abuse perpetuated in its production, for example.

While the drug trade can cause people to become victims (just as the legal trade in alcohol or cigarettes or many other commodities), such victimhood is incidental to the production and consumption of the illicit good rather than inherent to it. I think this distinction between what sorts of contraband could be traded on Silk Road (even if it was not adhered to in practice) is a big part of why many people were/are sympathetic towards Silk Road.