Why I photographic inanimate objects
I love photography, but shooting people is just too icky. First off, if you shoot a person or small group you really ought to ask, but I'm on the shy side. Secondly, if you intend to use the photo in some commercial setting, you need to ask for/negotiate/get a "model release". Too much hassle.
That said, the inclusion of people in photographs makes them that much more engaging to those who view photographs: people. Landscapes are pretty, but people draw you in.
I just don't want the aggravation that comes with 'candid' shots of people, so I live with shooting rocks, trees and buildings, and hope the local gendarmerie are looking for terrorists somewhere else.
Of course, you can get hassled for shooting somebodies building too, so really rocks are about all you have left that are at all safe.