The system failed Vitali as well.
As aviation professionals we recognise that the system failed the ATCo... he was left to do his job without the technical and human resourses he should have had. He was not at fault, but his error contributed to the accident.
What of Vitali K? He helped organise the flight to Barcelona and lost his wife and children as a result... his emotional life was destroyed with that aircraft. To try to understand what he felt is beyond me and, I think, most of us.
Was his plight recognisable? It is now! Where was the support that Vitali needed?
The death of the ATCo is his fault, but ....