Here is (believe it or not!) a very illuminating blog discussion (illuminating blog discussions are a bit like black swans) regarding whether bank-capital regulations, even if they did help cause the crisis, can justly be blamed on the regulations themselves or on the bankers who took advantage of them to "leverage up." The discussion was prompted by my post here last week and was begun by Mike Konczal of the Atlantic business blog. All credit to him for pushing me on whether a regulatory inducement (as opposed to a command) constitutes a form of deregulation, not regulation.
Also relevant: an article on bank capital from today's Financial Times.