Is there some information that this question is based on? I haven't heard about people helping to bring down Silk Road. Who helped?
Anyway, my position is that the destruction of Silk Road is good for Bitcoin, but it is bad for humanity.
Read the
Maryland indictment.
The first person DPR allegedly took out a hit on was SR-affiliated and got busted, and apparently turned informant. When DPR supposedly took out a hit on him, the guy he hired to do it turned out to be a fed.
The second was the FriendlyChemist guy, who supposedly tried to extort money from DPR. DPR also communicated with someone (perhaps the same someone) purporting to be "redandwhite," one of FC's suppliers, to whom FC supposedly owed money. Since it's not clear how these guys ended up being referenced in the criminal complaint, it is entirely possible one of them was also a federal informant, and/or both of them were the same person. Again supposedly, the feds found this through monitoring the private messages at SR.
(If it turns out both of these guys, the Maryland indictment guy and FC/raw, were informants, DPR might have a defense on the murder solicitations, basically that there would have been no violent crime if it weren't for the feds manufacturing one--i.e. like the John DeLorean case. He'll have a tougher time arguing that wrt the drug charges, though.)