Japanese internment camps,
Those were a black mark on American history, yes, but they're not even
remotely comparable to what the Germans and Japanese did.
the firebombing of various Italian and German cities (as in, the civilian parts)
Care to give me a citation?
and the nuking of two Japanese cities
Which was the lesser of two evils. There were about 200,000 Japanese casualties as a result of the nuclear bombing of Hiroshima and Nagasaki. A study done for Secretary of War Henry Stimson's staff by William Shockley estimated that subduing Japan through invasion would cost 1.7–4 million American casualties, including 400,000–800,000 fatalities, and five to ten million Japanese fatalities.
say yes, pretend. "Not quite as bad as Nazi Germany or Imperial Japan" does not equal "good".
True. On the other hand, there's a very big difference between the fundamental nature of American war crimes and those of the Germans or Japanese. See, when the Western Allies committed war crimes, it was generally a case of going too far in pursuit of legitimate military aims. For the Axis, on the other hand, the war crimes were committed because they wanted to exterminate the "untermenchen."
Even when extermination wasn't the objective, the British and Americans were nowhere near as awful as the Axis. For example, people make a big fuss about Dresden, but they conveniently ignore the fact that it was a legitimate military target. The Nazis, on the other hand, bombed Rotterdam
after the Dutch had already surrendered. And keep in mind, the Dutch were considered "Aryan."
EDIT: Not even bringing up the war crimes of the USSR, who may I remind you, we're on our side.
True, the Red Army committed a lot of really awful atrocities. However, you were specifically talking about Americans.