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There are many other “whys” in this (and every) case. (Including, for instance, several related to ATC).
I´m seeing none with ATC what so ever.
For example - Russian newspapers informed that after clearance to descent pilot get the clearance to the right turn, just against the mountains. If true, it could be a contributing factor. Aspecialy in case of Russian pilots. They are used that ATC have much more responsibility.