I don't think it's really about having a bad day or even a 'tough life' - just a feeling of something missing.

Check out the top few graphs of this page: http://technology.timesonline.co.uk/tol/news/tech_and_web/ar...

The theory there is a weak father figure in Steve Jobs' life (he was adopted) caused him to "form a unique view of things and be driven to find followers."

Sounds a little hocus-pocus maybe, but I think there's something to it.