Two generations, minimum, of Americans have been raised primarily in day care by strangers. Think about that. I believe it has had serious impact on national social mores, the way we greet, meet, and treat each other. Which is to say, shabbily to poor to violently. 

Says a lot about us as a nation, when we walk and drive around, with our heads down staring at our pacifiers. No human qualities on display much, anymore. Letting a car in front of you in a traffic line, or in or out of a parking lot or side street; no holding doors for others by looking behind us as we enter or exit; no returning shopping carts to pick-up points so they don't block others; littering everywhere; road rage; shootings for no reason. Our family values and moral fiber are weak to non-existant. Our natural propensity for acting out emotionally, irrationally, violently, sometimes deadly, is so much more so in evidence the past 30 years or so. Really sad to observe.