I allied with BOS throughout the whole play through, have finished the game, and the Institute and Railroad are gone. However I'd also like to kill the BOS, if possible. Is there any way to do this?
@GEnGEr My thoughts, exactly.
There are no actual quests to destroy the last surviving faction, but you can have so much fun mass murdering them at your own risk. Just make sure you save the game before you start the ultimate destruction.