The defense learned during discovery that there was an affidavit from one of the investigators suggesting that Karpeles was a likely SR suspect. That suspicion was based on Karpeles position in the BTC ecosystem and, more damningly, on the fact that a public website promoting Silk Road was running from Karpeles own hardware.
It turns out that Karpeles had hardware with a Silk Road website because he ran a hosting company. Someone paid him to stand up a machine that hosted that site.
That someone? According to the evidence discovered from Ulbricht's laptop: Ross Ulbricht.
He will be in another trial.
For all the non-violence fans in the room; Should a heroin dealer who tells his lackies to beat up the competition face a longer sentence than a heroin dealer who initiates no violence? The Federal Sentencing Guidelines think so.
They work on a system of Levels to categorize how bad his crime was:
Narcotics Trafficking over 5kg of Cocaine: Level 30
Narcotics Trafficking by someone who directs violence: +2 Levels
Narcotics Trafficking by someone who promotes their enterprise via mass media: +2 Levels
Narcotics Trafficking by someone who maintains a property to produce drugs: +2 Levels
Etc. etc. So instead of the ~15 year minimum a Level 30 charge would face, Ross is looking at more like a 24 year minimum sentence that corresponds with Level 38 charges.
Ask yourself: Why wasn't he charged with these crimes?
Don't defend this man, he is manipulative human garbage.
Of the two sets of charges, one was a much more easy conviction - the drug dealing.
It's not the prosecutor's job to introduce clouds of doubt into a prosecution. And this is not a case of "better ten guilty men go free than one innocent man be found guilty". He was, apparently quite overwhelmingly guilty of the charges related to running Silk Road. Why risk a conviction by charging him with something that might not stick (yes, I realize you can be found guilty of some charges and not others, but a whole world of doubt is introduced)?
Now, to be fair, these allegations (not lies, allegations) could be just that. Allegations. The prosecution will need to prove them to get a conviction. The reason he is facing these separately could be that these attempted murder of a federal witness charges are much harder to prove and thus convict on.