The Chinese have a low trust factor.
The Europeans tend to have arrogant elites that make stupid decisions.
That leaves mainly the USA and its dollars.
Make a list of the countries which have better fiscal management than the United States right now. The list is quite short. Places like Switzerland, Singapore and maybe a few surprises like the Czech Republic.
Now make a list of the countries with worse fiscal management. That list is quite large and even includes massive economies like China-- home of new shopping malls which are nearly empty, unsustainable military spending and billions in U.S. Treasury notes not because they love us, but because they can't find a safer return.
Understand how fractional reserve banking operates. Deposit $1000 and get a $10 annual return at 1%. That $1000 enables the bank to loan $5000 which they will probably not loan out at less than 5% or a $250 annual return. Call it $242 after a 3% allowance for default. They are basically making 24:1 less the usual costs for salaries and offices. And bankers are mostly pikers compared to places like the fed, insurance companies and the like.