I am glad that Ulbricht has been pardoned and I feel like a small iota of justice has been returned to the world with this action.
If Ross let drug dealers sell fentanyl-laced drugs, which ended up killing someone, he absolutely should be charged.
Those deals wouldn't have been possible without his platform. Sure, maybe the same drug dealer would have sold the bad stuff to some other poor user outside silk road, but those dealings that ended up happening on silk road are his (Ross) to own.
As far as I know, SilkRoad had a whole reputation system in place to allow users to flag untrustworthy sellers; that system was inline or even ahead of what many "legal" marketplace had put in place. A part of why SilkRoad was so successful is precisely because overall that reputation system allowed users to identify trustworthy sellers.