From my point of view Occam's razor here wouldn't be assassination. It's would be as mentioned above, mental health and overwhelmed by the sheer impact of your whistleblowing.
Maybe there is no Occam's razor here if there's no obvious answer.
I hope this is just bad phrasing and will assume you mean just for this whistleblowers case. We don't know though.
Assassination AFTER the whistleblower information has been released and is now out in the open really doesn't make any sense to me though. As conspiracies go, its not even humorous.
I’ve seen enough vindictive behavior in corporate structures that if assassination is on the table at all, so is assassination after the cat has been let out of the bag.
That said suicide due to extreme demoralization is also a plausible explanation.
You don't have to assassinate the whistleblower, but merely extra-judicially harass them as much as physically possible and let whatever happens happen.
Boeing may not have needed/wanted him dead, but managers have done plenty of petty bullshit retaliation before, for far far less.
From my point of view Occam's razor here wouldn't be assassination. It's would be as mentioned above, mental health and overwhelmed by the sheer impact of your whistleblowing.
Maybe there is no Occam's razor here if there's no obvious answer.