>Your facile equivalence is rejected with prejudice.
It's your facile equivalence, that because these specific things don't apply to the US, American imperialism was morally justified.
You could just read the Wikipedia article on American war crimes, or learn about how much of the Nazi's ideology was based on American eugenics and racial segregation, or take even a glance at the last several decades of American militarism throughout the Middle East, but I guess you won't.
The US absolutely had a purposeful genocide of native americans, and directly implemented prison camps and some property confiscation of japanese immigrants and citizens.
This is explicitly not a support of the parent's comment. The US was not great, and even had explicit segregation, but was not trying to spread it's own abysmal ideals to all of europe. Hitler was clearly trying to spread facism through all of europe, and eventually the world. His desire to do so was broadly popular in Nazi Germany, so the country's people were never going to stop him. Going to war to grind Nazi Germany into the dust was the only option. It is justified. We also didn't preempt anything. We sacrificed two sovereign countries hoping to avoid that war, which should be clearly not acceptable.