FWIW, Switzerland has a higher GDP per capita at $82k as compared to $62k for the U.S. Swiss per capita defense expenditures are closer to ~1/4 (28%) of those of the U.S. as compared to ~1/5 (21%) when judging by GDP percentage. (Conversely, France and U.K. have GDPs of about $42k, so they compare much worse by that metric.)

But more importantly, Switzerland isn't a NATO member.

The defence spending isn't much compared to the social expenditures. Switzerland spends roughly 30% on social/welfare (and roughly 10% on transportation infra). US spends roughly 50% of its budget on social/welfare and it ain't getting better any time soon.

And part of US Defense spending helps defend countries like Switzerland. Maybe we still spend too much, but we also "defend" a lot more countries than ourselves, and a lot more territory than Switzerland.