Charlie wore a bulletproof vest and took precautions — no doubt multiple death threats had been made against him. And yet, the surrounding rooftops weren’t secured — again, just like with Trump. That’s basic Security 101. They should have been monitoring the roofs. People even spotted the gunman there before Charlie was killed. WTF?! This shooting should never have happened. They allowed it to happen.
A few trained drone operators scrutinizing the venue could've prevented the shooting. Same with Trump in PA.