Firstly, I apologise for not reading all posts in this thread but I've read a lot of them and here is my take on the "negative aliens" debate.
I think Greer and Kerry and Bill are talking at cross-purposes on this subject and I don't think the way to resolve it was to have Bill and Kerry sitting on either side of Greer, both talking at him at the same time.
Okay, this is what I think both parties are saying. Greer is saying that when an alien race becomes so technologically advanced that they can travel the universe then they are subject to moral/spritual limitations which means they wouldn't be allowed to go and destroy another race. Even if they could or would, some other advanced alien race or council of races would stop them. Therefore, he says the idea of negative aliens coming to harm us is disinfo.
On the other hand we have Kerry and Bill who subscribe to the Law of One channelled information -
http://wiki.lawofone.info/index.php/Main_Page which states that there are positive beings, "service to others" and negative beings, "service to self". Therefore, an alien race that is "service to self" could come here, negotiate with the powers-that-be to get what they want from us in exchange for what the PTB want, and they could say to the "service to others" aliens who are watching, "look, these humans are agreeing to give us what we want therefore everything is fine over here".
So when Kerry and Bill were arguing with Greer, it seems to me that Greer was saying no alien race would come here and wipe us out (correct in my opinion) and Kerry and Bill were saying there were negative aliens who could do us harm in some way (also correct, in my opinion). Neither side seemed to understand they were talking at cross-purposes. When someone mentioned "service to self" it seemed to me that Greer looked puzzled, as though he hadn't come across this term before, yet no one picked up on this. They should have told him they weren't talking about aliens wiping us out with an invasion force, there are other ways for negative aliens to harm us. We elect the PTB, they do deals with the aliens which negatively affect us, and the aliens can say that we have agreed to it. Why didn't Kerry or Bill explain this to Greer when he was saying they wouldn't come here to blast us with their weapons?
All it takes to resolve this, in my opinion, is some simple, calm, effective communication between the two parties.