To avoid troubles and stay mysterious. 🤷🏻‍♀️

They're afraid.

Amateurs!

Perhaps, its about their perspective too!

I mean a good photo is a good photo, if they post it they are happy with it more than likely so it probably captured the moment they wanted it to

Most people dislike being photographed by strangers?

Because mostly, the fronts are less attractive ;)

Candid photography

Street photography often depicted some sort of human element. Sometimes a bike passing by a staircase, sometimes it's the back of people. And some street photographers who lack imagination like to photograph people from the front. ;) Hope that answered your question 😁

Some people are ugly