The Parkland shooting: Why are mass killings so common in the United States? 23 February 2018 On February 14, an American horror story played out in southeastern Florida when 19-year-old Nikolas Cruz opened fire at Stoneman Douglas High School, killing 17 people, including 14 students. In April 1999, the country was stunned by the … Continue reading The Parkland shooting: Why are mass killings so common in the United States?