They are lazy because they are not hungry.
In Third-World countries, the facts of life are that if you have no marketable skills, you starve. And I don't mean this figuratively -- these countries are not wealthy enough for a welfare safety net.
The parents of the 50's and 60's were people who grew up in the 30's, when life could get really ugly if you didn't have the skills to compete. If we had a situation where failure to get your kids educated enough to compete meant that the kids would live in Third-World-style poverty, and the parents would starve to death in old age, you would see a lot more achievement.
Man, that's worth repeating often! I grew up poor. The message that was drummed into us kids was that we were poor because Dad didn't have an education.
Of course, all of us are educated and far from poor.
And, BTW, we all got educated in fields that had good possibilities for employment. We didn't take majors in Women's studies, diversity programs, or social studies.