Well, I don't want to give you the wrong idea. I'm not an authority here. (I'd be a little dumb commenting with this account if I were.) My activity was very minimal, to the point where I doubt law enforcement would find it worth their while even if they knew who I was and the extent of my "involvement". I'm replying because those more involved might not want to share their (more informed) experiences for obvious reasons.
In my experience, at the lower levels I think the vast majority of the community wouldn't have actually done anything. You don't have to do anything to sit behind a keyboard and "support" the idea of an informant getting knocked off or roughed up. How could they justify supporting that kind of violence? In my opinion, the place had kind of a revolutionary appeal. Like the darkmarkets were going to change everything. How could the system maintain these dangerous and harmful laws if we are here, operating in plain sight? I'm sure that would only be bolstered by the extreme convenience and safety the whole thing provided. Nobody really wanted to go back to the old way of buying and selling, for a lot of them online had been their only actual experiences in this area.
Further up the chain, some of those guys had serious amounts of money involved. Some had people under (or worse, over) who depended on access to this site. There was tremendous financial stake involved.
Further, I remember a lot of people felt that there were people in the community who would actually follow through with this sort of thing had there been enough actionable intelligence. I'd be surprised if there weren't. Or they could just hire a hitman. It seemed like a doable thing to have some big-deal drug dealer or one of his guys do something like this. This is literally just speculation though, as there was no public discussion that I ever saw involving anything resembling this. I'm pretty sure at least some of the people would have objected on the grounds that it might draw even more LE attention to the place.
I remember reading some discussion going on about one of the darknet sites that shut down and stole everyones money. A lot of people wanted the stolen coins tracked down so they could go after them and serve them justice. Some people thought it would actually happen. Others thought even if they were found, nobody would do anything. Who really knows.