A nice article from the U.K. news:
Street photographers fear for their art amid climate of suspicion
"To some, the very idea of covertly photographing strangers might seem “odd”, even distasteful. And yet a proportion of those same people will own a print of Robert Doisneau's Kiss by the Hôtel de Ville, or have sent greetings cards showing 1930s Paris, as recorded by Brassai. Street photography has given us a lot. More, perhaps, than we know."