other random thoughts:
Presumably good angels shun demons?..
Angels/demons don't have a mediator so satan and all demons are condemned to death as they are sinful, 'bloodguilty', and have no means of reinstatement..
If, as the bible says, adam and eve were subjected to an edenic test of obedience/freewill, (as jesus was tested by satan ) were angels also subjected to a test since they too have 'free will'? if so, how could they be tested?...unless....human creation is itself a test of angels. since presumably there were never any demons or fallen angels prior to man's appearance on earth....oh dear, I appear to be rambling again..!