Lousy Doodlebugs

Traditional graffiti rationales suggest that signing or marking public spaces and objects allows underrepresented groups disenfranchised from mainstream media channels to express themselves and for the economically underclass to claim property.
Or, to simply say, "I am here."
Even I, seemingly mild-mannered librarian, had a period where I staked my claim on innocent inanimate objects with hopefully evocative but ultimately hard to read signatures, A.K.A. tagging.
But, you know what? I never wrote in books. Even in books I owned. Even in the text books the bookstore was kind enough "to lease" to me before I sold them back at the end of each semester.
And library books? Forget about it.