Positive feedback loops and natural human tendencies toward herd behavior keep the process going until a point of excess is reached and the debt becomes a major problem. (ritholtz.com)
Once you have formed any opinion on a subject, it's a perfectly natural human tendency to cling to that opinion, and «both sides» do it here. (realclimate.org)
Our natural human tendency is to put it off until later, diverting into mundane tasks like Facebook. (entrepreneur.com)