Now that some of the heat seems to have gone from this debate I thought I should address this point. I tend to approach this subject from a purely commercial aspect. Commercial problems ought to be solved by commercial measures - not mob rule. A contract is a contract no matter who the contractors are. If you don't like the terms of a contract then don't sign it. You don't enter into a contract, enjoy the benefits of the contract then say, "I am not bound by this contract because the other guy is <-- insert bad words here -->".
Like it or not, the people have given their government the authority to borrow money on the credit of the nation - without any caveats whatsoever (it's written into the constitution). Until the people revoke this authority, governments are free to legitimately deal with any criminals they want. Even if the authority is revoked, that only stops the government from borrowing money in the future. It is not a way of reneging on existing loans which the government took out with the (implied) blessing of its people.