You can’t compare the situation after WW II with the current situation. The axis stopped attacking us after they surrendered. While the terorist groups get support from some countries, they are independent entities that can’t be stopped by defeating or controlling individual nations.
Not really true. We held a force in Germany called the US Constabulary until the early 50’s due to insurgent activity. It was the Constabulary’s duty to prevent outbreaks of violence. There are many recorded examples of Germans who were not happy with the way the war ended. Many feared another treaty like the Versailles Treaty which screwed Germany for years after WWI. Much of the violence occured along Germany’s southern border with Italy. For example there were many clashes with Serb forces who wanted payback for Nazi violence in the Balkans.
You do have a good point about the differance between fighting a government, such as Germany, and fighting the Taliban. Since we are not fighting a government we can’t really call what is going on a war. Which, technically, makes us a bunch of illegal invaders. Which is just what they’re calling us. This is another good example of why we need a Constitutional convention and fix the countless things wrong with the government today. The country is fine, the government is our problem.