Feraud was a scary psycho nutjob
Didn't anyone think that French army officer, Feraud, was a complete nutjob? He projected all his angst, anger, insecurities, hate, frustrations, and the kitchen sink upon an innocent man, fellow French army officer, D'Hubert. Who knows why he chose D'Hubert?
It really, really scares me that in life some a$$hole out of nowhere will just decide YOU are going to be his life's enemy and you have no idea why he hates you. Hasn't anyone reading this ever ran into some person who took an immediate disliking to you for no apparent reason? And no, it doesn't have to be race or ethnic-related. Often times it's just something about you (me) that just rubs a psycho person the wrong way.
Feraud was capable of making close friends. The man had some kind of charisma and personality. Notice how he collected a knot of very loyal, French army officers to him as friends, including the tall, almost mute French officer. I never knew a army officer could be successful by being so quiet. By all logic, Feraud and D'Hubert should have been the closest of friends. D'Hubert was a real nice guy if you knew him, but I saw that D'Hubert could be misunderstood as being aloof and overly formal if you met him for the first time. That I understood, was part of his higher social class ettiquette upbringing which was misunderstood by the lower social class Feraud (even though both men were of the same military rank) as being insulting and demeaning and being looked down upon. Still, that is no reason to dislike someone so intensely enough to kill them. Today in 2012, when you encounter a snobby person, you just ignore them.