Hitler and the Holocaust

[Minimalist]

The allies bombed and strafed rail lines all over Europe throughout the war,they were not overly difficult targets..

Yes, with proper tactical aircraft, British Mosquitos, American P-38s, etc. But in 1943 deep penetration heavy bombing raids into Germany without fighter escort were suspended because of unsustainable losses. It was the P-38 and its replacement the P-51 that were used in that role. At the time the Allied command said they could not reach. (And even with relentless assault on German transport systems they had no hesitation to continue to divert rail assets to the transport of Jews.)

AND Bombing the CAMPS would have SAVED thousands of lives. (destroying the rail lines and the ovens)

Apparently Mr. Roosevelt and Mr. Churchill were not willing to take that risk. It's very easy to second guess from a range of 65 years.