One or several people must have spent many hours of their lives researching and writing this manual covering, presumably, virtually every possible query anyone could have about a mezuzah. What could be more important?! To some people it might be how we interrelate to other human-beings. For some it is clearly ritual and symbols.
Islamic State militants blow up ancient Arch of Triumph in Palmyra (Reuters)
from the article: IDF Rabbinate shows non-Jews the door in mezuzah book ruling