I'd also argue he almost certainly saved a huge number of lives with Silk Road: the ability to view eBay style feedback and chemical test results makes buying illegal drugs far safer than buying them on the street. On Silk Road people could buy from a reputable seller with a long history of providing unadulterated products, and could view testimonials from other buyers who had sent the products for chemical analysis.
After Ulbricht ordered the hit on one of his forum moderators, the FBI visited him, took all of his computers, told him they were going to be "him" from now on online forever, had him "pose" in a bathtub where they hosed him off and doused him in ketchup to take fake trophy photos, had the "hitman" send the photos of Ulbricht, who famously commented "It had to be done."