Of course drug dealers don't want drugs legalized. DPR claimed he wasn't just a simple dealer but rather some ideological crusader for a better tomorrow (by which he meant: anarcho-capitalism, his idea of utopia). He wasn't only selling drugs remember, but also malware, forged documents, he experimented with selling weaponry, etc ...
Source?
Source not needed. One only had to visit SR to see this.
I don't think DPR was the one selling all of that. All of that was available on his marketplace. A little different, no?
Sure, and the South American cartels are simply 'facilitating' the movement of narcotics between growers and end users by the same, ultimately irrelevant, logic.
What DPR was actually doing was taking money from drug buyers, and then drop-shipping the drugs using his network of suppliers as the supplier-shippers. He'd then pay the supplier-shipper for their service once he confirmed his clients (SilkRoad users) got the narcotics they had paid SilkRoad for.