Enrahim
Hero
I think you with this has convinced me that "destroyed" for minions indeed is meant to override the general 0 hp rule.I agree with that, and it fits with my interpretation. The "destroyed" wordings in the MM are typically attached to a monster feature. Examples include the Lich's "Indestructible" feature, the Skull Lord's "Triple Skulls" feature, and the Vampire's "Destroyed by Sunlight".
That means that they are not inevitably in conflict with Knocking Creatures Unconscious. For instance, one could reduce a vampire to 0 hit points by some means other than sunlight and in doing so choose to knock it unconscious.
That notwithstanding, when one of these features is invoked it takes the creature directly to destroyed. In such circumstances (i.e. where the feature applies), the creature can't be knocked unconscious. It's game state becomes destroyed and players don't get a choice about that. They don't get to have sunlight knock vampires unconscious, for example.
The circumstances attached to the Minion role are "takes any amount of damage". So in the same way that a vampire is destroyed by direct sunlight, a minion is destroyed by any amount of damage. Players don't get a choice about that.
To dismiss vampire would be cherry-picking. My interpretation covers all creatures that are destroyed, including vampires, equally.
However I still then maintain that while a vampire destroyed by sunlight is commonly understood to be a pile of dust, a destroyed god is commonly understood to be basically eviscerated from reality, and a ceramics bowl destroyed by falling from a table is generally recognized as broken pieces; I do not think a similar common understanding of what a ogre minion "destroyed" from a whip attack looks like in the fiction exist. And I do not think 4ed does any attempt at all at clarifying this?