Occasionally an event happens so spirit-sappingly depressing to make us wonder if those millenarian, "hell in a handcart", death knell-sounding types in the Mail's employ might actually have a point after all. Here's one: two cops are on sick leave following an attack by a mob in Croydon, after they had the temerity to ask a 15-year old girl to pick up her litter. The mob, some 30 people strong and made up largely......