Speaking as a programmer, you don't think everything is always going to be ok, but you don't care about it too much as long as you know there are exception handlers in your code for different kinds of sh*t, and if something goes wrong they'll manage to handle the situation. So, the only thing you should care about is your exception handlers being up to date and able to handle the kinds of sh*t they're meant to.
Honestly speaking, there are not many KINDS of sh*t that could happen to a country, and I think the US "exception handlers" are working well for now.
I'm a bit sorry for this parallel, but I assumed you were gonna get me right.