Some CEOs are incredibly thin-skinned, they hire a bunch of people who usually got kicked out of the police after they harassed/beat someone, and then self-destruct with their own personal army when they can't handle the heat (you will get criticised daily).
Btw, something that was coincident with this (I believe) was the activist campaign against EBay...again, the number of executives who self-destruct when they see proof that they are bad at their job is significant (I wouldn't like to venture a guess at a proportion but I have seen this 10+ times).
Just imo, the problem is always lack of oversight. Boards not really asking whether the executives are up to the job, fat expense accounts with lots of these ex-police nutjobs stalking people, it is just total madness. Companies become captured by these executives.
(I used to know a guy who ran a relatively small fund but used to short sell frauds, mainly accounting as the guy used to be an accountant. He had to go to great lengths to hide what he was doing because the second a company found out, they would send people to wait outside his office/follow him/etc. and this is just a nobody guy running a small fund in a mid-tier financial city i.e. not London, or New York, or HK...I call these executives the Harvard Business School Al-Qaeda, truly dangerous people).