BRYAN PETERSON, RED RIVER PAPER BLOG:
"Many photographers are purists. How do I know? I’ve met them at the many slide shows and lectures I’ve given around the world, and many have taken the time to write me and share their staunch belief that 'staging' or 'propping' a photograph is tantamount to 'kidnapping.' The argument is always the same: don’t mess with the 'natural' scene before you; shoot it just as it is!
"Why? That is an important question, and I really want you to think long and hard about why people are so dead set against removing or adding something to a scene. Well, so much for giving you enough time to think long and hard about this! The argument is weak and here’s why: by the mere act of choosing a lens and cropping an image, you, too, are removing and adding something to the overall composition."
Read more, here.