Dumbass Sayings: “Left For Dead”

Sometimes when the son you forgot you had tracks you down fifteen years later he says “You put me in a dumpster and left me for dead!” Left you for dead? Is that proper English? I think you mean “left to die.” Why would anyone say “left for dead” when they could just say “left to die”? Saying “left to die” is fewer letters and is grammatically sound. If someone saves your life you don’t thank them for “making you for alive.” Even saying “left for death” sounds better. That might actually make sense because you’re being left for death to claim you. If someone leaves you for dead then you have to think maybe it’s due to your lack of understanding the difference between adjectives, nouns, and verbs.

"He'll be fine. Dead will find him."