I was refering to the kind of books that the parent comment also refered to: > There has been at least one book about how "Germany/Germans are getting dumber",

I was refering to the kind of books that the parent comment also refered to: > There has been at least one book about how "Germany/Germans are getting dumber", "The Big Crash is Coming" or something similar on the Spiegel Bestseller list at all times. Not all books on the list are like that but there is indeed at least one of them at any given time. And those particular books never require the reader to change.