You did fine when you wrote this:

"While the U.S. owes a lot of money, its debts are denominated in USD and its economy is very strong and diversified. "

But then you lost me when you wrote this:

"Therefore, creditors believe that the U.S. given time will be able to service its debts. This prevents the extreme capital outflows and attacks on the currency that cause a debt crisis (it’s usually being mired in this seemingly hopeless debt crisis that tempts policy makers to print excessive amounts of money)."

The quantity of money theory was debunked long ago and our policy makers know it. The US will always be able to pay its debts, regardless of its revenue position, because it has an infinite amount of its currency available for Congress to spend. It has no need for "investors" and their opinion of its fiscal health.

As long as it doesn't accept debt in any denomination other than US dollars it must first spend/create money to make it available to be collected as tax or borrowed as bonds. Infinity+whatever you invest or pay is still infinity.