My reasoning is that before and during the war you can see a pattern of deportation attempts. Before the war, they had the idea of helping the Jews migrate to Palestine through the Haavara agreement. When that didn't work out, they had the idea of The Madagascar plan, but when that was deemed unrealistic, they tried to send Croatian and Slovakian Jews back home, but their host countries wouldn’t take them.

I'm reasoning that the Germans came to the conclusion that maybe nobody would ever want the Jews in their countries, so that's when Himmler gives the order to preserve life in 1942, and from that point on, the conditions of the camps begin to improve and the whore houses are made...

Britain was even too scared to take in Bulgarian Jews as late as 1943, because they thought if German Jews asked to be allowed to go to Britain Hitler would let them. Quoting from the British foreign secretary:

"That the whole problem of the Jews in Europe is very difficult and that we should move cautiously about offering to take all Jews out of a country like Bulgaria. If we do that, then the Jews of the world will be wanting us to make similar offers in Poland and Germany. Hitler might well take us up on any such offer and there simply are not enough ships and means of tranportation in the world to handle them.”