Credit Derivatives: Ban speculative Buyers of 'Protection'

News that speculators are betting that municipalities and federal states in the USA may default highlights the urgent need for reform of the credit derivatives market. Not only does the ballooning of outstanding trades create a substantial risk of default by one of the participants in the market it also creates problems in the wider economy by accelerating and exaggerating real or perceived weakness in the credit ratings of various issuers. There is no reason why those without an insurable asset should be allowed to buy 'credit protection' - nothing is 'protected' and it is but a speculation on default. The argument that you need speculators to facilitate a liquid market so that  investors (banks, bond investors) with genuine reasons can protect themselves,  does not hold as you really need only SELLERS of credit protection to satisfy this requirement. So speculators are more than welcome to provide liquidity as sellers of credit protection. Adjusting legislation would mean that derivatives traded outside recognised exchanges would again be unenforceable if they are not hedging against a pre-existing risk.