Two years ago, a mother in Hong Kong was accused of suffocating her three children in their home in Sham Shui Po. Police said they found blood stains on a pillow and in the mouth and nose of one of the girls. The mother was arrested after she and her brother alerted the force. Last year, a debt-ridden father threw his seven-year-old son off the rooftop of a shopping centre before he jumped to his death, while the boy was critically injured. Hong Kong has been repeatedly shocked by cases centred...