A few decades ago, you could support a family and buy a house on one income, with only a high school education. That is not remotely true anymore.
There just is nowhere near the amount of well-paid blue collar jobs, so there are not as many people getting those jobs. Simple as that. This is a big part of why income inequality has become bad. You seem to think that people have suddenly become much more lazy and shiftless than in the past, which is
The contract for the cleaners in my office[1], for example, starts its base wage calculations by adding $0.50 to the minimum wage. All the increases and adjustments begin at that number.
[1] http://www.seiu32bj.org/wp-content/uploads/2017/11/2015-CAD-...