“will inadvertently do the right thing and repudiate the debt.”
Yeah, I tried that. Refused to pay my mortgage, car loan or credit cards. Funny thing though, I got evicted from my (former house), my car was repossessed, and I could no longer use any credit cards.
That’s the difference in scale. Owe a few hundred thousand, the banks own you. Owe a few hundred billion, you own the banks.