These documents by themselves do not show any government complicity in a plot to kill Occupy leaders, as this article strives to imply. This was a criminal investigation into people that were allegedly talking about doing this.
As to why the targets of this investigation weren't arrested, in order to be arrested for conspiracy to commit a crime, you have to actually take a step toward executing the conspiracy. Planning or talking about it is not enough for an arrest. The FBI receives alot of information, much of it from criminals trying to save themselves, that turns out to be neither actionable nor credible. This appears to be an investigation that simply didn't go anywhere.
As to why the targets of this investigation weren't arrested, in order to be arrested for conspiracy to commit a crime, you have to actually take a step toward executing the conspiracy. Planning or talking about it is not enough for an arrest. The FBI receives alot of information, much of it from criminals trying to save themselves, that turns out to be neither actionable nor credible. This appears to be an investigation that simply didn't go anywhere.