Flower, I think they are suggesting it's the pilots who cannot see anything, but even then if you have a primary radar you are quite dependant on transponders being turned on.
Hairiest place I know is on final to Sedona in Arizona on a Sunday morning. People use runway 3 to land and 21 to depart, they are usually impatient to leave, and on short final it's like dodging missiles (except I don't know what dodging missiles is like, but I've seen James Bond movies). I've had to break off on final several times with planes shooting past me within a few hundred feet. Then you get people coming up from behind. Nasty place, not sure even the restaurant is worth it, needs a tower when the Sunday drivers are around.