When Coral Springs police officers arrived at Marjory Stoneman Douglas High School in Parkland, FL, on Valentine’s Day, they saw not just the officer assigned to the school but three more Broward police officers with pistols drawn but taking cover behind their cars as a gunman was inside killing 17 students and staff, CNN’s Jake Tapper reported Friday, citing sources. When those Coral Springs police entered the building, the four original Broward officers on scene did…