>it's not like there's a chain of provenance, and there's no particular guarantee that whatever grade of pure drugs was sold on Silk Road is the same purity that ended up in peoples' bodies.

The fact that the majority of listings on the site were for personal use quantities suggests that the majority of sales were to end users rather than traffickers.

It's hard to dispute that this saved lives and I would speculate that it saved many lives.

>That doesn't mean that large sales weren't made, or that those weren't in fact a significant portion of the site's revenue.

Nobody made any claim that large sales weren't made, of course they were.