If the gentle reader comes to find this post months or years from now, you will want to start with this post, then with this one.
Well, well, I have so many places to go. I will make an effort to be nice. I am seeing some amazing arguments on other sites. Staggering.
Something I often notice when I write posts that get under people's skins, I see better arguments against me than are being presented. For example, what about zero hit points? Zero hit points are supposed to be unconsciousness and not death, no? I don't think that's strictly AD&D, though, so perhaps that's the reason it hasn't been brought up. Still, I could write a post adjusting my numbers, allowing that more 1 hp humanoids might survive, since some would be hit and not killed, so that they might heal and return to a combat later.
There's also this argument floating around that monsters and NPCs don't know how many hit points they have. This is definitely a post. There's the situation where a high-level combatant knows to withdraw before dying (are they allowed to do this if they have no idea of their hit points?). As well, two 1 HD humanoids, with 1 and 8 hit points, not only 'look the same,' apparently they feel the same. There's no reconciliation of health, training, size or build that's inclusive - I presume so that the DM can freely say "the biggest one is on the right" without the players knowing that's the one with the most hit points. Apparently, the players knowing these things would break the game.
I also considered a post describing why leaders would be particular about whom then entered battle with. As a leader, I would tell the 1 hp cretins to go home and keep just the tough 7ers and 8ers. But yes, I forgot, you can't tell the difference between hp totals. Yes, that's right, I can look at 14 friends and associates on a soccer field and immediately know what my first choice is going to be for my team - and pick my way right down to the last member. Yet, I have no idea whatsoever about who in my tribe has a greater chance of surviving in battle.
(Sorry. Laughing. I need a moment)
I've already tried the Socratic Method. That doesn't seem to have made any impression. Therefore, I'll stop asking questions.
I believe I'll make a well-established argument that is almost certain to be ignored - since it is an argument that has consistently failed to make inroads among true believers of the faith. So far, that would describe the group that has decided that 1-8 hit points per die, regardless of logic, is sacred.
Still, I might make some converts. One never knows.
Whatever particular explanations that people would like to invent for why a combatant on the battlefield has 1 hp, there's a certain truth that has to be acknowledged. It doesn't matter if why some of the tribe has 1 hit point. It doesn't matter if they're injured or if they are the runt. It doesn't matter if they know how many hit points they have. It doesn't matter, because once the battle starts, those with the lowest hit points are going to die. Those with the highest hit points are going to survive. The ones that survive are going to go home and procreate. The children resulting are going to have higher hit points. Because they have to.
Unless, of course, the reader would like to argue that there is no such thing as evolution.