Quite right Brad.
The Concentration Camps were not up and running by 1939, were they? Certainly, the world as yet had no idea as to the depravity of the third reich. Thus, the ship was probably turned away as a matter of normal immigration policy.
Bombing railroad tracks from 10,000 feet is no easy feat. The tracks can be easily repaired, and if timing is unfortunate, the trains themselves could have been hit with prisoners inside.
Also, we did not have unlimited bombing capability. We had to select among what were surely too numerous targets. Those places directly responsible for producing goods for Germany's war effort, (munitions factories, fuel depots) were of the highest priority, and most worth risking lives and resources, relative to ending the war effort. To charge that US leadership was prejudiced or dishonorable because of the decisions they made is a way beyond the pale, Id say.