And yes I would be fine with that, even though I have some treasuries in a 401K somewhere. But do understand, since we are running huge deficits this means instant 'austerity', say goodbye to all your freebies.
The reason it is moral to default is because most people had no choice in running up the debt. It's immoral for a person to renege on their debt, but if I take out a debt and claim you owe it, you are correct to say hell no. Even if I take it out, give you a small portion, and then say you owe the whole thing.