I'd argue accumulating too much wealth compared to your salary can be a bad thing - for example, real estate compared to salary is even more expensive in Europe than the US - so the extra money doesn't go anywhere useful, you just get to pay more for the same stuff.

Also, if the US person pays less taxes, but has to pay for a bunch of services that the EU person would get for free, that means the US person has a lower savings rate, even though they're paying for the exact same stuff.