OFCs may be tax havens, regulatory havens or both. They have long been used for a variety of purposes, including tax evasion, tax avoidance and regulatory avoidance.
Taking action against global tax evasion and improving standards in global financial regulation are both laudable goals, but they are different. Promoting exchange of information for combating tax evasion has little to do with the financial crisis. Improving financial regulation is very relevant to the financial crisis, but has little to do with the enforcement of tax. Moreover, success in either of these goals is unlikely to have any effect on international tax avoidance. Only substantial developments in the way international income is taxed will change that.