Causes of the global credit crunch

It is too early to fully understand how it could happen that the World's Financial System got close to a global meltdown during the past 12 months. Some blame greedy bankers, others lay the blame squarely at the foot of the (US) consumers. Institutional Investors also appear entangled as they allowed managements too much leeway and even egged them on to pursue ever-more risky expansion plans. However, we tend to think that regulators - and their paymasters the politicians - may have to take a large part of the blame.
Unfortunately they are the party that is the least likely to bear the full cost of their mistakes. Shareholders have to suffer from dramatically shrunken share prices, scores of bankers have lost their jobs, or are about to in the near future. Bureaucrats are happily engaged in the blame game and are joined by academics and media people who often are also less than objective in their judgement.