So, no railroad bombing arguments are valid when you are bouncing around moral quandries ~
Sorry, but that appears to be a strawman argument. Whether or not they were bombing the railheads to the camps is irrelevant to the fact that Dresden was still a legitimate target for both rail and industrial reasons. It would have been nice if they had been bombing the camp railheads, but then you would probably be whining about any German civilians who may have become casualties while living near those railroad lines and railheads.
Dresden was a valid target, pure and simple. The evidence is quite clear in that regard. Because we weren't bombing someplace else doesn't make it any less of a valid target. There is no quandry other than the false-front one that you are attempted to construct.
Because the Allied war in Europe had nothing to do with Jews. We were pursuing three objectives: 1) Liberate France and the Low Countries, 2) Protect Britain, and 3) Preserve the USSR.
Roosevelt didn't want Jews in America as refugees and was very proactive in preventing it. Stalin shed no tears over the genocide in Ukraine and the Baltic, he probably thought it was a good idea.
The concentration camp videos in "Why We Fight" were from Buchenwald and Dachau, which were very bad places, but non-denominational prisons where the death of inmates was the result of starvation and disease.
The crimes of Germany against the Jewish people in the East, and via transport from Western Europe (especially France), were never part of Allied war aims and, to the extent that most people today believe they were is an example of false memories.