> the one person involved who was explicitly not responsible
Not to condone revenge killings, but Nielsen was obviously part of this accident. It was his choice to work alone that night (rather than waking the other controller) and to allow the technicians to turn off most of his instruments, so the responsibility is partly his. He also issued the fateful descend command - had he literally stayed out of this, the Tupolev pilots would have followed the TCAS guidance and the accident would not have happened.
He did not cause the accident, all the reports on the accident say his actions were the result of Skyguide, the company, as it tried to make public safety profitable.
To put it simply, blaming Nielsen for this accident is like blaming the worker in a car factory that puts the last part on a Ford Pinto.
Not to condone revenge killings, but Nielsen was obviously part of this accident. It was his choice to work alone that night (rather than waking the other controller) and to allow the technicians to turn off most of his instruments, so the responsibility is partly his. He also issued the fateful descend command - had he literally stayed out of this, the Tupolev pilots would have followed the TCAS guidance and the accident would not have happened.