That tendency of social thought to generalize, to describe a leading tendency in a society in such a way that it seems that everything falls within its iron laws, is very common. Of course our own experience tells us that life is not as monochrome as these thinkers depict it. On the other hand they are very valuable because they alert us to transformations we are likely to take for granted.
All that five thousand kids lived in those five thousand houses, owned by guys that got off the train. The houses looked so much alike that, time and time again, the kids went home by mistake to different houses and different families. Nobody ever noticed.