>>13793987>>So it was forbidden to kill jews in Germany, yet Hitler wanted to kill all the jews... hmm...
This touches on the Functionalism-Intentionalism debate. If the Functionalists are correct, then Hitler never ordered the holocaust, but did encourage people to have an antisemitic worldview and dehumanize jews, which in turn lead people lower in the nazi hierarchy to kill jews under the impression that Hitler would have approved of it. The Intentionalists believe the Holocaust was explicitly ordered by Hitler or other high ranking leaders, however I believe there is not a ton of hard evidence to support this.
addressing your image:>Zyklon B was a fumigant
Correct. And it was even commercially available for this purpose many years after the war (under various brand names)>The Americans called it DDT
That's not correct, DDT is not the same chemical.>if top-down orders to kill jews had been given, none would be left
I think this is a strong argument tbqh. This is one of the reasons I lean more towards the functionalism camp. Nazi leadership dehumanized jews but stopped short of ordering their utter extermination. Various lower ranking nazis nevertheless started killing them, in a largely uncoordinated way using improvised means. Zyklon B can in fact kill, in high concentrations; it's just hydrogen cyanide. That's why, normally, it was sold with an odorant to warn workers when they started to breath it.