“Thank God he wasn’t killed!” This is how one of Nelson Mandela’s former head of security expressed relief that the assassination attempt on Donald Trump was not successful, noting that the US was on edge and violence would have followed.Trump survived an assassination attempt in Butler, Pennsylvania, on Saturday when a shooter fired at him during an elections rally. It appeared the bullet grazed his ear.The FBI identified the shooter, who was taken down by the US Secret Service, as 20-year-old Thomas Matthew Crooks, from Pennsylvania.Rory Steyn, who served as the Gauteng head of the…