The more rational proponents of the arguement generally view the camps and rails as secondary rather than primary targets. The idea that the camps should have been bombed at the expense of true military targets is silly.
Another thing that factored in—during World War I, the Allies wildly exaggerated atrocities committed by the Central Powers. There *were* documented atrocities (whole villages razed and hundreds of civilians killed) but not to the level that the Allied governments and news media of the day reported. When this came out after the war, people became very skeptical of reports like that.
In the end, though, you’re probably right—the Allies simply decided to concentrate on what they saw as military targets, and the concentration camps would’ve only been considered as such in regard to how they helped the German war effort with slave labor production facilities. Besides, were the USAAF and RAF bombing Poland, even in 1945? They could’ve hit camps in Germany like Buchenwald easily, but Auschwitz and the Polish death camps were in the Soviet area of operations.
}:-)4