>It is also my experience that some people completely destroy their books. I don't know how it happens. I don't think of myself as careful with books. I shove them in backpacks, insert random objects to remember my place, take them outdoors, etc. Yet somehow, the books look much the same afterwards.

Yep, this is me too, and with everything else I own too. I don't treat them like museum objects, but they generally look very good even after lots of use.

Some people just can't do this. Honestly, I don't know why. It's just how they are. Maybe they don't have an intuitive sense of how much force is really needed to handle things, and they use far too much? Much like a small child. I'm not sure. Hence my use of the term in another post, "clumsy oaf".

You can see this with some people's cars too. You get in a normal person's car that's a few years old, and it looks fine, though maybe the seating surfaces are obviously not brand-new and it's not perfectly clean. But you get in one of these oaf's cars, and even after a year, it's completely destroyed inside and the interior looks like it's decades old.