Oh, if you mean that many Jews died in the camps from "Allied" bombs, and (as German industrial capacity collapsed late in the war) disease and starvation, I am in total agreement. I don't think it was millions but probably hundreds of thousands died needlessly. The Nazis (who sent them to the camps) are ultimately responsible. I also believe there were some intentional mass murders of Jews, particularly the decimation (in the precise meaning of the term) of the Warsaw Jews following the Warsaw uprising. What I doubt are the things modern scholars doubt, like the electric floors, the vacuum death chambers, the rollercoaster of death, the human skin lampshades, etc. Plus I also doubt the gas chambers.