It is not an issue at all. It's pure bullshit. You're not a partisan in the sense of being a Democrat or a Republican, you're just anti American.
Um. You should study more history.
Allied war crimes during World War II - Wikipedia
The actions taken by the "allies" during World War II were often as criminal as the actions of the Axis powers. To admit this is not saying that the world would be better off if the Axis had won. It is acknowledging the truth of our history.
Churchill called the fire bombing of Dresden a Terror Bombing. Curtis LeMay said the best thing about the Atomic Bomb was it ended the Fire Bombing of Japanese Cities. Air Marshall Harris admitted that had the Allies lost the war he would have been tried as a war criminal.
Is it unamerican to admit the truth? Or to be patriotic citizens must we spout propaganda that is demonstrably untrue? Again, these things happened. They are proven.
How does it help our nation to deny these things? We can learn from our history or we can repeat it again and again.
The allies did some terrible things during WWII, and if we had lost the war, our leaders would have been tried as war criminals, but you are mistaken to think what we did was anywhere near as horrible as what the Axis did. Furthermore, the criticisms of the US in WWII has been exaggerated by Cold War propaganda and is deeply tainted by racism.
For example, everyone knows about the fire bombing of Dresden and nearly everyone condemns it, but the fire bombing of Tokyo killed more people than the two atom bombs combined, yet one rarely hears it mentioned. Do America's critics think white German lives are more important than yellow Japanese lives?
In any case, it is bizarre to say actions committed by America three generations ago in any way makes us hypocrites for condemning the gas attacks in Syria today.