I doubt anybody who's ever been in a serious band will be particularly surprised by the stories. Some of the behaviour does seem very extreme, but it's tough being that close to the same people day in day out, creating with them, travelling with them and socialising with them.
Can't say I've ever witnessed behaviour quite as violent as some of what is described, they do seem like nutters, but there are a lot of arguments. Now add in that two of them are brothers, and jeez, that is a recipe for tension.