"They had stopped thinking"

In the last sentence or two of Postman's book, he writes out these sentences: "For in the end he was trying to tell us that what afflicted the people in Brave New World was not that they were laughing instead of thinking, but that they did not know what they were laughing about and why they had stopped thinking." In the last sentence, he makes a distinction that people in this world are now becoming stupid, they do not know what happens around them, they just find it all funny and they do not even think about it. This distinction matters because it is very true. People these days do not think about what they do, they just do it and think it is funny that they did it. Everything is a joke to people nowadays, no one takes anything seriously.