Sorry but that's not an argument from ignorance. YOUR argument is an argument from ignorance: there is no evidence that this organisation exists, therefore it does. Our argument is that it's your burden of proof to show that it exists. Otherwise I can posit that the Federation has a clown division. I mean, we never see any clowns in Starfleet, so there has to be a separate clown corps, right ? No, they refered to Kirk and his crew that way.