Every time an author states that borrowing from a library "steals" sales from them, I want to scream.
Publishers have indoctrinated authors against libraries, to authors' own detriment. Libraries buy your book, and if it gets popular, they buy more copies--but more, they introduce readers to your work, and those readers will spread the word, even if they don't buy your books themselves.
#Libraries are unpaid marketing. Be thankful.