It's not people in bands, is it? Why do people who take drugs, why are they in bands? 'Cos they're trying to prove themselves. To make themselves blank and numb and not able to communicate with other people.
Not to want to say, not to know what you want to say, not to be able to say what you think you want to say, and never to stop saying, or hardly ever, that is the thing to keep in mind, even in the heat of composition.