we’re challenging you to play FPS by the real Rules of War, to show everyone that even wars have rules—rules which protect humanity on battlefields IRL.

The only reason for the red cross to tell players to do such a thing is if they think players are likely to become soldiers and act like they're still in the videogame - which, aside from being retarded even as a basic premise... would still make this a bad idea.

The lesson players will learn from playing like this is that it's a losing strategy and expecting your honor to be reciprocated is a recipe for disappointment and feeling like a fool for even trying. They will learn they that can be killed trying to render aid to a downed enemy. They will learned that a downed enemy who begged for his life may turn around and kill you and teabag your corpse the first chance he gets. They will learn that there is absolutely no benefit to them to not kill every enemy they encounter no matter how helpless their situation may seem in that moment, because situations can change in an instant. You won't have to play many rounds of PUBG to learn this.