I can't say I know every detail of the case but I don't recall anyone getting killed or even hurt by Mr. Ulbricht so in my mind the punishment does not fit the crime. IMHO the death penalty should be off the table completely (go Nebraska!) and life in prison reserved for only violent offenders. You can argue that he enabled people to harm themselves but I think that's stretching it. If people want to take drugs, even take too much drugs their going to get it somewhere. If drugs were legal and treatment of abuse the focus instead of punishment Silk Road wouldn't have existed in the first place.
The prosecution brought this up at trial but he was not charged or convicted of this in the criminal trial.
Go Team 'Murica....
Even the most ardent proponent of full legalization usually acknowledges that many drugs are very harmful--they just believe the people should be free to do things even if they are harmful to themselves.
I generally support decriminalization or even legalization, but I would be reluctant to allow internet sales. I'd require sales to be through licensed dealers and in person, so that an addict cannot completely cut themselves off from human contact. Internet sales make drugs too easy.
Even as a proponent of full legalization I know that as little as a few minutes spent in water can kill someone, and often does.
Why people are allowed to casually dive into this toxic substance is beyond me. No licenses, no regulations, practically any body of water you can find you're allowed to jump into totally unsupervised.
Most places don't even have signs warning people of the danger, and worst yet, many children practice a dangerous activity called 'swimming' in this substance often daring each other as to who can drop the highest from a rope into a potentially fatal body of water.
Also, once you start drinking it you need to find at least 4 litres of this a day to keep from going into water withdrawl, commonly known as dehydration, this can happen in as little as 3 days with out your daily fix.
It's not true that areas unsafe for swimming are not marked - they are; moreover, there's both infrastructure in place to increase safety (e.g. lifeguards) and a significant amount of effort put towards educating people about the dangers of things like jumping into the water in a potentially unsafe place.
But that's all beside the point. Laws and rules do not exist in vacuum, and humans are not spherical cows of uniform density. Time and again history has proven that most people can handle exposure to water safely, while they can't handle being exposed to hard drugs. You can blame this on individual stupidity, but people don't have perfectly free will, and if this stupidity predictably touches big fractions of a population, it's time to mitigate it.
It's not true that products unsafe for smoking are not marked - they are; moreover, there's both infrastructure in place to increase safety (e.g. physicians and filters) and a significant amount of effort put towards educating people about the dangers of things like using tobacco in a potentially unsafe manner.
I believe that time and history has proven that prohibition solves little, where infrastructure to increase safety and effort put towards educating people results in "less harm" -- a much better outcome for all. Some people will make a harmful choice (e.g. heavy smoking, fast food diet, sedentary lifestyle, using chainsaws alone), but society as a whole should not be punished for the choices of the few.