The original post of this massacre should not be a stage for political "what ifs"; 59+ families are never going to be with a member of their family again and 500+ families have a member of their family with a long road of mental and physical recovery ahead of them.
Being a retired LEO, I know what both groups of families have ahead of them; pray for the Police Officers, pray for the EMT's, pray for the hospital staffs, pray for the survivors and most of all, pray for the victims and their families.