The motive with a suspect is always suspect...would strikes and low wages be enough to hijack a plane, or being kicked out of the military..Cooper told them it had nothing to do with Northwest...past that is anyone's speculation. riots in prisons due to treatment, Pentagon papers, we have an endless amount of grudges that could come into play..
Rackstraw has a grudge, but it's from his own mistakes. he knew what he was doing was wrong, so it's kind of hard to really blame the military. sure he was pissed off, but again, he caused it...if they removed him for different reasons then perhaps he would have a legit grudge.
Christiansen, wrote some letters complaining about the strikes..lots of employee's were upset. I'll bet a lot of them left too. Kenny stayed, that tells me he was DEDICATED to his company..not the opposite. I have plenty of emails expressing concerns to several of the companies I work for...one could conclude I have a grudge. actually, it's concerns during a certain time period and not a totality of what is going on...to me, it appears Kenny was venting his frustration during that certain time period..his staying decades past is telling about his real commitment to the company...