>>>Better yet - don't attack anyone who doesn't attack your homeland.
>
>On that basis, the only war the US would have entered in living memory was retaliation against Japan in WWII- in the Pacific, not Europe.

Yes.
However, when Japan attacked, Hitler declared war on the US which made conflict inevitable.

Korea, Vietnam, Afghanistan, Iraq etc. were wars of choice.
Reasonable people disagreed about Korea then and a case can be made either way even now.
However, all the others were disastrous mistakes.