The way I understand my money market settlement account at vanguard, is that it's all, or nearly all, treasuries. Treasury not honoring government debt would be the worst bank failure in the history of the world.
It would be bad for you, but you also deserve that because you have made a deal with the government to enslave young people to pay taxes on their labour in order to pay interest to you. Loosing all your investments in a bond default would be a very fitting consequence for what you have done so wickedly.
I am one of those young people laboring and paying taxes. It's not clear to me what I should do with the surplus of my labor that is available to me, that would be acceptable to a worldview like you seem to be espousing.