The USA being predictable for 80 years hasn't really moved the European needle on defense.  I ask you, "Why do I remember Russian tanks in Hungary, Poland, Czechoslovakia, and East Berlin better than the Europeans?"
We've been more than predictable, patient, and kind to our friends. Since 1990, we've begged, cajoled, and begged some more. They have literally laughed at us. (At least, Merkel and Macron were smiling indulgently at Trump 1.)
You can add the numbers like I can. The USA has literally spent 130% of its GDP on defense since 1990. We've begged NATO to spend? About 70% in the same time frame (2% per year, for 35 years). 2024 was the first year that even a majority of our friends voted to spend above the 2% threshold. 
How long do you think they will maintain this spending level if "peace breaks out" again in Ukraine?  
Do you think the peace will be lasting?   NATO's stated goals? Keep the majority of US troops in Germany, and "forward position" 4 battalions across Poland and the Baltics.  That's 4,000 soldiers on the front lines.  That's their existing 2% plan.  
In 1989, 100 Divisions in Germany WERE the front line. Today, ten Divisions (100,000 soldiers) should be maintained on the "front line", not in Germany. 
That's a tithe of the manpower sitting in 1989 Germany. 
p.s. Our children's children will be paying for the interest on our debts, partially incurred to protect NATO, 5,000 miles away.