No one works harder than people whose lives are threatened [for example, by starvation] and they are working to not die.
The logical conclusion of this is that we should bring back slavery and extermination camps because that’s how you maximize the efficiency from of humans. /s (obviously)
Same reason Siemens, Volkswagen, Bayer, and many more, including a ton of American ones were onboard with the Holocaust.
Genocide is good for business.