The incentives are not there due to current wages/steep inflation/public debt/large supply of workers that dilute wages, various economic bubbles which price out of whack, so on and so on...
People found more comfort in greasing the government/underground economy/day trading, etc... than being what is referred to as a “wage cuck” that sees a productivity and wage gap with the traditional economy that cannot keep up with the cost of living.
Even STEM degrees are getting to be worthless due to “cheap labor” and cost control measures.
When you put all your focus on appeasing shareholders, doing anything you can to lower labor cost like outsourcing/renting politicians to import cheap labor/appeasing certain demographics, and other short-term civilization destroying policies you are going to get a negative reaction.
People didn't need as much stuff. Many could get by without a car. The food was made by scratch, and a radio was the only entertainment appliance. Plus, since women generally were not working, there wasn't the glut of labor supply.
These posters are the type that think there are "jobs Americans won't do".