There's a bigger world outside the island of U.S. There are more political regimes, tax regimes, banking restrictions and all sorts of uncertainty that needs sound and cheaply stored/secured/transferrable money that would protect a person and their family/community against all these issues.

Just the recent multi-trillion debt expansion is a pointer to that. You can't and you won't store your savings in USD-denominated cash. Your options are either getting in debt and tying yourself to a certain credit institution/jurisdiction, or getting some freedom by exiting into Bitcoin.