I think the harsh reality is he was a foot soldier, and the people who encouraged him got away (so far)
"The document [that Hayes points to] instructs Libor submitters to clear their judgements on the rate with certain named traders. Defence lawyer Neil Hawes last week suggested the traders held derivatives positions dependent on Libor."
http://www.risk.net/operational-risk-and-regulation/news/241...
I think the idea behind the Nuremberg defense is that you can't refuse orders b/c it's the military and refusing orders can be punishable by death