People did not see how much they hurt the book. Yes they were not alive, but they still have feelings. They also affected those that read the book later on. "They should not be allowed to check out books if they do that." It should be as much of a crime as stealing a book.
Kavi also did love math, but reading about it was just not as interesting as science, at least to him. "Well the last book was on how to clean up landfills, through science." He shrugged. "But I find I want a book on a scientist this time. Or maybe something a little more thought provoking."