[armchairhacker]

IIRC government bonds are the "safest" option. Because the only way you lose them is if the US government collapses; and even if you think this could happen, if the US government does collapse, you have much bigger issues and also can expect every other currency to collapse as well (including Bitcoin/crypto, because most people will simply not accept it)

[przeor]

How come, maybe they just stop printing new dollars when the govt collapse?

USD can exsist without govt. It can't exsist without army behind the paper , at least on paper.

[kolinko]

There were multiple cases in history when governments failed, I think their currencies never survived this. Hyperinflation in such situations tends to devalue money so much that it's not worth the paper it's printed on.