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.
https://s3.amazonaws.com/s3.documentcloud.org/documents/1391...
Please remember: the argument isn't "did the government conclusively prove that Ulbricht attempted to commission a murder".
It is: "There was no such thing [here: <<evidence of a murder for hire scheme>>] introduced for the trial" (exact words taken from the comment rooting this subthread and the parent comment that provoked it).
That's not only false, it's pretty much the opposite of what happened: not only was evidence of the murder-for-hire scheme formally introduced at trial, but it was ventured at trial, in a manner that put a part of the prosecution's case on the line for it. Not only did Ulbricht's team have the opportunity to rebut it, but they were obligated to do so in the course of competently representing him.
Edited a bit for clarity.