Why did you even mention showing anybody the finger?
Because that's what leaders with "balls" generally do. They are no teamplayers and like to show off for the audience at home. Cooperation, common treaties and compromises are not high on their agenda.
It's some kind of "systemic"...having "balls" and showing other countries/leaders/enemies at home/ the finger.
And that is the big difference between the US and Germany. We are not our own continent with only Canada and Mexico as neighbours. We might be able to become a major power, but we are surrounded by alot of suspicious neighbours which would isolate us politically very quickly if we would do a Trump. It would kill us economically next...a beefed up military would be of no use at all.
Our weapon is diplomacy and cooperation inside the EU...that had made us wealthy, stable and successful like never before in our history. There is a lesson in that.
Yes, we could go it alone, just not for very long nor very successful.