It took two generations and a new constitution for Germans to regain trust again.

You cannot trust the current generation of U.S. Americans, and the U.S. Constitution certainly does not alleviate that concern. They elect a god-king like president who seemingly has unlimited authority. Why would you trust such a country for more than four years?

Edit:

> but after, I'm not even sure what exactly

Killing people outside the USA left and right without due process? Starting a war and thinking that it is fun while the whole world is suffering because of that war? Kidnapping a head of state? Cosying up to the enemy of your allies during a war? Threatening allies? Declaring parts of an allied country as your own? Supporting Nazis in allied countries? Supporting separatism in a province of your neighbor (and until recently your closest ally)? Proudly telling the world what country the USA will assault next? ...