As the U.S. turns its back on security commitments, Germany faces a profound shift in its post-war defense policy. Can it still rely on France and the UK?
Germany is at a crossroads when it comes to its security policy — one of the deepest upheavals of the post-War era.
Nukes are only useful if you are at the point where you want to end the world. Germany should focus peace where possible and the equipment needed to end wars in their favor when peace is not an option. They can't deliver Ukraine the tanks, artillery shells, and and so on needed, so adding nukes to their plate is just diverting their interests. If they want to do more airplanes or air defense would be much better to invest in than nukes. (I'm not sure what Germany as in either of those categories)
You are confusing can't and won't, Gemany and a few other countries have ability to produce a lot of weapons and armor, they really don't want to do it and corporations that make weapons also don't want to do it. So they obviously can produce more, but it would cut into profits on one side, and requires minimal effort and political will on the other.
Discussing nukes requires nothing and generates news, win-win.