I don't think this decision is for Germany to make. The US wouldn't let you off the hook so easily.
You are looking at this history through the EU lens....WWII did end 1945. In the last more than 70 years alot happened..and without the EU even more would had happened.
The EU had been always in a firm partnership with the US, without it it would had been back to alliances pro and contra...with Russia an influential player. The EU with it's atlantic bridge had been always a great enemy...without the EU all bets would had been off!
Germany is not just like any other European country which can do whatever they please.
No country can do whatever it pleases..get real Spike. It has interests and needs for support, with that come compromises and obligations, treaties...the same as within the EU.
The big players in Pentagon understand that.
Imagine the Pentagon wants to keep Germany on its side for every price...they would support Germany whatever it wants to do, even ruling Europe...as long as it is the foot in Europe for the US, the head quarter against Russia...Add to that the traditional allies and satellites...