I'm not doubting that US drug policy remains the driving force. It pushes people who would consume drugs legally or illegally into a black market where they inevitably do business with some extension of these powerful criminal organizations. I agree with all that - and it needs to change.
But too often I see people using the stupidity of US drug policy as an excuse for all sorts of morally reprehensible deeds. Case in point: when asked, Ross Ulbricht trotted out all sorts of high-minded rhetoric about freedom and libertarianism and the gross injustice of prohibition, but in private he was ordering hits on his own users, and as far as he knew and was concerned, the murders were carried out successfully. Is that in the spirit of libertarian ideology? Is that about protesting US drug policy or is it just Ullbricht's greed?
People will go through all sorts of mental gymnastics in order to rationalize their personal appetites. In the end the consumers of drugs have to know that they are buying from people who either engage in violence themselves or work for someone who does, and because they are participating in this marketplace they are in some way partially responsible for the violence that occurs because of it. It may be unrealistic to think that they will realize that - but we should not relax our personal criticism of them just because its convenient for our political position.