If wars were fought on paper using scorecards, you'd be right.
Before you make any statement about "winning" the war, you must first tell me: 1) what our objective was, and 2) how we accomplished it.
Our objective was to prevent the North Vietnamese from taking over the South. We had it won by making them militarily incapable of doing so. The Viet Cong was useless, the NVA was defeated every time they came out, and Giap would later say that if it weren't for the rebirth of the antiwar movement in Kerry's era, they would have stopped trying to take the South.
Vietnamization was proceeding well, and we were on track to have a relationship with the South like the one we already had with the ROK--You guys are your own show, but we're ready to provide massive combat power to defend you if your criminal neighbor invades. But then something happened...and that something is the answer to the question in my last post to you. So answer that and get back to me.