Umm, so the they had no right to occupy part is, in my opinion, correct but...."Thus, they were criminals planning to murder law enforcement..." is a pretty far stretch...unless of course you want to take a comparable "occupation" and apply the same rules.  By your standards, the Occupy Eugene people had no right to "occupy" the Washington-Jefferson Park and law enforcement had the duty to remove them.  Thus, they were criminals planning to murder law enforcement officers doing their duty, right?

I'm sorry, I don't agree with what they did, but simply owning and shooting a firearm does not a conspiracy make.  The only way your theory would be "indefensible" is if there were an actual written or recorded plan to actively and aggressively attack the law enforcement officers...which there wasn't. 

Just a guess here, but you're not exactly a super knowledgeable person when it pertains to the law, are you?  You may want to put the tinfoil hat back on and keep your theories to yourself...