You would be surprised, I have seen some things in my career that are insane and done for the simplest reasons, like ego, megalomania and most of all money.
I once was with a start up in which the CFO and the COO got into a fist fight in front of the entire company, over equity.
Another time I saw a VP who was running one division give everyone the day off, called in three of his trusted developers, and they all said that the development team was on strike and would not return unless the board appointed him the CEO. He then proceeded to run the company in the ground, while paying himself and his three developers handsomely.
And I have seen investors use all manners of leverage against the operations team to dilute their ownership. The stories about being diluted out of ownership are common because it happens all the time. I personally, was diluted out of my ownership in a start up. A 90 million dollar exit and I walked out with less than $100k as the CTO, a tough lesson in finance for me, but it happens all the time.
I have come to believe that for people that act like this, it is a game, and the game is not won if they cannot get every penny. It probably bothered them that I walked away from the table with less than 100k, because some how they did not play the game hard enough to get that from me. Somehow they are less of a person, if they don't win and they judge their self-worth based on it.
I am not saying that this is all, or even most, VC's, but they are out there, and you only need to cross one of them for it to make an indelible mark.