[pietvo]

I mainly agree with the OP. Stripping DRM from a library ebook is sometimes necessary. I am reading a book now which was in PDF format. I need a bigger font, however, than the PDF offers, and zooming doesn't solve it. So I need the reflow option. For this particular book it gives horrible results, however, and I had previous books which were similar. So I removed the DRM, converted it to epub with Calibre and cleaned it up with Sigil. I will delete the book when I finish it, or at least when it expires. Although it would probably not make much difference if I would keep it because I usually don't read library books twice. But then, why waste the disk space?

Once I was reading a library book and it expired when I was almost finished. I would need only one hour more. So in that case I decided to remove the DRM so I could finish it without the hassle of borrowing it again and probably having to wait for someone who had reserved it. The probability of someone actually borrowing it during the hour I deemed extremely small (it was around midnight), and as the OP says, it would not hurt anyone. Of course I deleted the book after finishing it.