AbdulAlhazred
Legend
Tentatively or not, these things can be established in the game. A general “kobolds serve dragons” in the same way that we in the real world know that ticks latch onto dogs, or “the kobolds of Dragon Mountain serve the ancient red wyrm Infyrana” in the same sense that the tick I just flushed down my toilet had latched onto my dog Kirby.
General or specific, either can be established as fact. This was my point.
I would argue, as a general tenet of philosophy, that such things are only established by experience. Had I not experienced ticks and dogs, then I would not hold a belief about it. I could be convinced of its truth due to the fact that authority figures say it is so, which is 'good enough' for fairly conventional and non-controversial things. For extraordinary things, like dragons and kobolds, then such authority is insufficient, or must be MUCH stronger (IE the paladin that dragged back the head of the dragon? I believe him. The village elder? His 'knowledge' is no more than rumor). Of course a character could be credulous and accept rumor as truth, but its still rumor, it COULD be untrue! Ticks are unlikely to be untrue, unless they're giant ticks that live in the Forest Nobody Goes Into, then legendary.
So, no, I don't think that, just because there's a story about something, that it is automatically established as a general 'fact'. Its a story, a tale, a rumor, or maybe at most accepted only due to its lack of fantastic character. Thus the entries in the MM MIGHT be rumors, some few of them might be accepted (the militia fought orcs 20 years ago, they can give you a first-hand account), and then there's direct experience, which is canonical due to inclusion in the narrative. Some things might be a bit gray now and then, we hear orc drums in the hills and some elves claim to have news of a town that they pillaged on the other side of the mountains. Maybe its actually goblins or something else, but we can at least suspect orcs and its having an impact on the narrative.