I've explained it to you multiple times now.
Please explain to me what about it is unfair.
A warning is given and the player is allowed to change their action. That seems quite fair.
Please explain to me what about it is inconsistent.
This applies equally to everyone, including NPCs. Engaging in a suicidal action will kill you. The rules of combat weren't meant to apply to suicidal actions. I see nothing inconsistent about that.
I never said anything about gravity getting its feelings hurt, so kindly do not misconstrue my statements.
I said that HP are made up of several factors. One is the character's survival response (dodging out of the way, etc). Another is supernatural factors such as luck and divine favor. However, as I see it acts of extreme hubris subvert this defense. If you try to kill yourself, the gods aren't going to be moved to intervene. Lastly is toughness, but this is not supernatural and cannot carry you through deadly trauma on its own. HP don't typically represent a force field or ablative dermal reinforcement.
If you try to kill yourself your survival response won't save you (you're performing a suicidal action). The gods/luck won't save you from yourself either. And unless you have some special ability that says otherwise, you're not tough enough to shrug off a 200 foot fall onto rocks, regardless of level.
I am absolutely serious. I have explained my position. I have yet to see much more from you than an implication that you don't like it and mischaracterizations of what I've said.