Flydive,
Missed the point again.
Yes, it might be better to know movements further away than those in your immediate surroundings.
But that does not justify the deliberate and unnecessary removal of SA concerning those near to you by deliberately and unnecessarily speaking a local language when both parties are quite capable of speaking good English.
It's a pathetic argument (to deliberately diminish safety just because something unrelated may be less than perfect), just bolstering the opinion that it's all driven by national pride.
There's no excuse.