Chain of blame
And let's not forget that although the controller allowed a bad situation to develop unnoticed, it was still a rescuable one. If the TCAS had been followed by both aircraft, the situation would have been saved - precisely why TCAS was invented and installed.
This fact has apparently been callously ignored in the Russian press (it was the wrong reaction of the Russian crew which caused their aircraft to deviate in the same sense as the freighter). That was the end of the chain, which began with one controller too little on duty and various ATC system maintenance programmes in progress.
With proper TCAS training and use, this sorry story would have been "just another airmiss" but perhaps one from which we could have learned a lot.
I also feel sorry for the German controller who witnessed the whole accident but couldn't contact his Swiss colleague due to maintenance on the telephone connection.
As for the killing, well it was premeditated murder and revenge, of which we see too much in the world these days. Judging by some of the reactions on this site, it is no wonder that wars happen.