It’s the wrong way to reach the right conclusion.

But yeah if you take care of the needs of the people, like housing, social medicine and so forth they will be more productive, will create more children and -as unintended side effect- be happier.

Squeezing people for every penny will make them more prone to revolt, so it’s basic reasoning: of you’re rich and want to remain that way, take care of the people doing the work!