For everyone that says a manual safety would have prevented this, I ask how? If the officer was going to put his hand on his weapon, isn’t it likely he would also take it off safe since he was thinking he may need it?
They normally don't cycle off the safety until pointing the weapon at the intended target. The statistics for negligent discharges with weapons that have a safety versus without a safety point toward far fewer negligent discharges with a gun with a safety.
Now, whether that's the design of the gun or the accompanied training with it...
He would have had to take the safety off before removing the gun from the holster, an additional dumb move required.
Still, we shouldn't underestimate him. ;)