The overwhelming victory of the decidedly not populist Labour Party should alert you that right-wing extremists are not invincible. What is going on here is a revolt against incumbency, not a massive turn to the far right.
But why is that? Macron and Biden have done a good job keeping unemployment down. Inflation is falling, even in the UK. Why is everyone so pissed off?
The unfamiliar impact of inflation is part of the story. I think the rest of it is attributable to the virus. You see it on the roads and on t-shirts as well as during elections–the survivors of the virus are angry and frustrated and want someone to blame.
If the populist right wins power in France and the US and delivers nothing but incompetence, chaos, and pain, which is far more likely than not, what happens then? Will the voters treat them with the same disdain they show for Biden and Macron? TBD.