> Originally their plan was just to force them to leave

That is 1930s pre-war Germany and Austria; and around 550k people by the most generous calculation. Yes, the world wronged them. But you cannot say death camps happened because the US didn’t hand out enough visas.

After 1939, when Germany invaded Poland (home of 3-3.5m Jews) and in 1941 the USSR (home of another 1-2m Jews) no one was being forced to leave (or live) anymore. People were being killed with bullets to the head or back, and when this started to be unbecoming/too inefficient, the German state devised an industrial approach to the killing of humans.