Among crimes that Allies have commited that have not been condemned as much as the German War Crimes are:
Remagen prison camp-terrible conditions.
Dresden-Became an inferno killing hundreds of thousands of people
Hamburg-Similar to Dresden
Attacking surrenderd U-boats including that of Werner Hartenstein-the incident is now known as the Laconia incident, Hartenstein's ship sunk an Allied vessel full of civilians, so he collected most of them up, allowed some inside of the boat, most stood on the deck, and he towed some lifeboats. The U-boat was displaying the Red Cross and the Geneva Convention states it is an offense to attack an unarmed unit displaying a red cross (the submarine was armed, yes but with hundreds of passengers lining the decks, there was no way that the boat was a threat). Upon making contact with an Allied plane (American I think) the aircraft was ordered to attack despite the knowlege of the Allied survivors. The aircraft attacked their own survivors to try to sink the U-boat. The boat cut the ropes to the lifeboats and dived, leaving hundreds of survivors from the decks in the water, while some were in the U-boat itself. Later Allied ships did manage to pick up most of these survivors. Werner Hartenstein was later killed in action when his U-Boot was sunk.
I would not be surprised if the Allies deliberately sunk hospital ships.
The sinking of merchant vessels in the pacific by Americans.
The dropping of the Atomic bomb on Hiroshima and Nagasaki.
There is no way that all of these are legitimate targets under the 1929 Geneva convention. Though there is nothing that says anything about how civlilians must be treated (I think) it is only common sense and humanity not to attack them
Also I think that a much forgotten fact is that the English invented the Concentration Camp.
As to the indoctrination, it is much easier to disobey a direct order form an officer when you are an American or British soldier who has no huge awe for his leaders and knows that the maximum he is likely to incur is a court martial, while if you are a young HJ boy and the enemy are closing fast onto the "Fatherland" and Hitler is your icon you have been taught to obey him always, he has been in power since you were about 5 and you have known no other life, then it is a lot easier to commit atrocities when commanded.
For example Henry Metelmann commited atrocities in winter, or the unit he was part of did and he still regrets it. He, and many others were just boys caught up in a tide of violence and racial ideology that they knew nothing about other than what the constant propaganda and indoctrination wanted them to know.