Well, I don't think they did it just because they were mean-spirited and bad-tempered. :-D
And I'm not sure there even IS a "one-size-fits-all" explanation for the phenomena. You'd have to look carefully at EACH particular one of those struggles, read what the participants had to say about it, read what historians have since learned, etc.
From the "Stalin/Trotsky" threads on this board, you can see how complex that particular situation was...I wouldn't be surprised to find similar complexities in the disputes you list.
But the short answer: people engage in "bloody struggles" when they feel that EVERYTHING IMPORTANT to them is at stake. It's what people DO.


