Given that Jews were a small percent of the population in Europe, and given that the Nazis occupied most of Europe at one point. Why not conscript another labor force for the needed work, and then kill the Jews? This is something none of the Believers here can answer.
The answer is this: because there was no extermination program, but Jews were a demographic the Nazis wanted out of the mix of other Europeans.
No, the answer is you have absolutely no bleeping idea about the history, and don't even seem to have realised that it was Sauckel and the GBA deporting non-Jewish foreign workers
to Germany while the SS deported Jews from western, central and south-eastern Europe, to Auschwitz, where some of them were kept alive to work
in an SS-run concentration camp.
Thus, the answer is incredibly simple: the SS was not the labour ministry, and did not control labour deployment; the SS was tasked with the Final Solution, and was organising the deportation of Jews anyhow; it also ran concentration camps like Auschwitz that required a substantial labour force for multifarious reasons. So it needed labour. The elegantly simple solution to this conundrum of diverging tasks was to unify them at Auschwitz, keep some able bodied Jews alive, and kill the rest.
I honestly do not understand why you and so many of your brethren persist with this silly strawman repeated yet again above. If every available source - including documents, as well as copious witnesses - has indicated ever since 1945 that the policy was this simple method of selection, then who do you think you are fooling by pointing to the fact that, duh, some Jews were indeed selected for work and thereby kept alive for a time?
Isn't that, you know, precisely what has been claimed all along, ever since 1945, except when deniers feel the urge to prove yet again they have absolutely no bleeping clue about the history?