Accountability.
If we pilots screw up with fatal consequences, we're either also dead or facing long prison sentences. Must give pause for thought for those in the ATC profession, I shouldn't wonder. If I were the Russian gentleman currently languishing in a ZRH remand cell, I'd be feeling like justice had been served. Two aircraft, same level, same frequency, converging tracks, middle of the night. There simply is no systemic excuse for that level of dereliction of duty and professional incompetence. The guy screwed up, and he's paid for it with his life.
Controversial statement? Perhaps, but consider the impact of our decisions and how they effect the lives of those who depend on us for the safety of their loved ones.