It was just an example. Taxes in some European countries are higher, Sweden for instance.
So I guess you have to look at the tax rate you would have to pay in each country you are interested in, and calculate that it would be added to your U.S. rate.
This was not a comment about France. I just happen to know a couple who live there and the guy makes a lot of money so he doesn’t care. He loves Paris. But I wonder how high U.S. tax rates would have to go for him to give up his citizenship.
Don’t take it too seriously. The comment was about France, not an affront to your notice of the double taxation.
As stated in one of my previous posts, I suppose you could just move your money to the Caymans and disappear to someplace where your visa was secure.