edit: this section of reasons’ article summarizes the situation nicely.

“Now that Ulbricht has no chance of having his initial conviction and sentencing overturned or adjusted, it's likely the feds out of Maryland decided the indictment no longer was needed to make sure the government had some further means in their back pocket to punish Ulbricht for showing a safer, saner way around their insanely damaging drug war.”

the reason the charges were dismissed is similar to the reason he wasnt charged initially: because attempted murder charge was unnecessary from the prosecutors point if view. not because he is innocent of the charge. the article also notes that torture was an element in those murders. this guy should not be walking free