Puppy wrote:
Perhaps a slightly gentler, more encouraging tone? Something along the lines of:
"Our goal is to make an encyclopedia of [[free content]], and uploading an unfree image of a building that someone else could photograph will do far more to harm our goal than it will move us closer to our goal. If you cannot buy a camera or borrow one, or talk a friend with one into contributing, then it is best to not upload an image at all rather than an unfree one. You can always contribute in other ways!"
But then you have to demonstrate the "harm."
-Jeff