Originally posted by pavpen But looking at B&W posts I see 99% of the pp high contrast images (with narrow DR scale.)
Unless it is done intentionally to make a certain artist point, most likely is from lack of understanding of post processing techniques where you can change the gray level in a non linear form to essentially "equalize" the histogram and reveal details as needed.
Most street photography adheres to the notion that the image must preserve what the photographer's eye (and camera) sees, so post processing manipulation should be as little (if any) as possible. So it is understandable (and almost expected) for street photographs to have that harsh high contrast look. After all you have very little (if any) control of the light there.