There were some killed by German snipers. They killed the snipers. Your point was that if Iraq still needed American troops, then we didn’t win. We won as long as we were there. There would be no Isis in Iraq if American troops had remained, as they remain in Germany even today. Now, I agree with you, it was useless, and laughable, to try to build a Western democracy in Iraq, which has no tradition of democracy, and a dislike of Western ideas. The best hope was to install a somewhat benevolent military government.
Since we are comparing WWII to George and Dicks excellent nation building adventure, google up pictures of Japanese and German cities circa spring 1945. That is how wars are won. Not by building schools, roads and Muslim democracies.