Hassan Jihad Kareem, a schoolteacher, was thrown from the Goliath roller coaster at Six Flags Over Georgia on October 13 and died; he was riding with his six-year-old son. Witnesses heard clicking and unclicking before the ride started and say the restraint on his seat became unlatched. The Goliath has no seatbelt, only a pull-down latch, and Georgia requires annual coaster inspections. Georgia's insurance and safety fire office opened a separate investigation. Six Flags closed nine coasters across six parks, its stock fell 14 points to its lowest level since 2009, and Magic Mountain closed X2 and a second ride after about 20 brain-damage lawsuits, while the park kept its Final Destination-themed Fright Fest maze open. What remains open is…