If there are blind spots -- unblind them.
The engineering firm I work for just managed construction of a maintenance facility for a railroad. There were a bunch of security cameras in the original contract. Once the building had been completed, the railroad's security people had a meltdown over gaps in coverage, and something like two dozen more cameras were added by change order. They basically have cameras watching the cameras.
The people in charge at Parklands shouldn't be fired, they should be tarred, feathered, and run out of town. Did everyone pick up on the fact that the security guard/assistant football coach who first saw the shooter enter the campus (but didn't confront him) has since been suspended because it came out that he was sexually harassing two or three of the female students?