A plot to kill LEO's, could very easily be concocted by agovernment informant, without ANY backing or planing by the militia members. Here is how I know.
A few years ago there was a white supremecist org. called The World Church of the Creator. The leader of that group is a guy named Matt Hale. He is currently serving a 35 year prison sentence for plotting to murder a supreme court judge.
Matt Hale's "body guard" an undercover informant that had infilltrated the group, calls up Matt Hale on the phone one day, and says that the supreme court judge that had ruled against his org. about the rights to use the name "The World Church of The Creator" needed to be assassinated. Matt Hale replied "I want nothing to do with this", and hangs up the phone.
I believe the next day he was arrested for plotting to kill the judge, because he did not explicitly say "NO DON'T DO THAT" or something like that. Point is, he was charged and convicted not because he endorsed or plotted, but because he did not say to his follower's, "don't do that orI will call the police".
He was convicted not for plotting, or endorsing the actions, but for not going out of his way apparently to say, "don't do that".
It would bevery easy to see these militia guys sitting around a fire one night drinking a few beers, and some agent, just drop a few crazy ideas into the conversation, and another member, expanding on the possibility, but not endorsing or plotting, and the agent who gets paid to help get people busted recording the conversation, and ALL of it being taken out of context, and used against the militia members. It does happen, and actions speak far louder than words.