It actually comes from my experience that most people are avoiding thinking about their "stuff" appropriately - i.e. clarifying what it means to them and what they intend to do about it. It only takes a few seconds to decide if something is actionable, and if so, what the next action is - but people avoid that decision like the plague. They think if they think at all about it, there's way too much to think about... so they don't think at all! And then it's hung up like a psychic albatross around their neck.
Hope that helps.