We know that the poor man had seen the danger of the collision too late - tried to avert it and that TCAS called an opposite manouver from the one he gave.
From that point on any blame lies at the door of the pilot training organisation - on the Russian side. Always follow TCAS - I guess we know this by now - there are enough incidents to show what happens if you don't.
The pilots, as are their passengers and crews, dead. The ATCO, obviously was not killed in the crash but left alive to come to terms with a terrible realisation. The support of his family was needed.
And now this. A Russian relative of one of the killed passengers said live on TV tonight, that he thought the ATCO should have been "locked up in a bare room for 99years and not allowed visits from his children."
If that kind of understanding and sentiment is typical, then God help us all.