Authors have been known to contemplate titles for their books for long periods of time, and often, the title of a book, can have a great effect on sales. Sometimes, it seems that the author was drunk when choosing the title of his book. Here is a book I just found:
Concentration Camps: a traveler's guide.
I can imagine that the millions of people who were tortured in the camps or lost loved ones in the camps would not have a liking to a "traveler's guide" to the place of their nightmares.