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Because your idea of a conventional “win” isn’t the objective for the US in these “wars”.
Weapons manufacturers want to sell weapons, pharmaceuticals want opium to make opiates, control of energy supply though oil and now precious metals (think lithium) /minerals, military higher ups rack up accolades/battles/medals as a prestige symbol, etc.
The longer you keep the racket (War) going the more money and influence all these industries make over two decades, specifically with this latest business venture.
The “US” didn’t lose anything. They intended for these god forsaken engagements to go on for as long as possible.