Specifically, the paper states:
> In this section, we show that the 1932 and 1933 vote share won by extremists was related to influenza mortality of a decade earlier. This mortality was positively associated with right-wing extremist vote shares, such as the national socialists, and negatively (though insignificantly) with the share won by left-leaning extremists.
So, the 1918 pandemic did not lead to just extremism; it led to right wing extremism. (I'd suggest changing the title to reflect this, if possible.) This is a danger that we are facing right now in the US.
Are we? Show me some actual evidence.
Yes, there are some similarities between our situation and 1918. But there are massive differences. We should certainly observe the situation to see if the pandemic causes people to radicalize, but it's rather alarmist to conclude that it is already happening, based solely on this.
From https://www.csis.org/ground-combatting-rise-right-wing-terro... :
> Right-wing terrorism is on the rise in the United States and across Europe. In the United States, right-wing extremists were responsible for nearly 50 killings in 2018, a 26 percent increase over the previous year.i,ii According to the Anti-Defamation League’s latest report, 2018 was the fourth-deadliest year for domestic extremist-related killings since 1970 and of those attacks, right-wing extremists were responsible for almost 78 percent.iii
From https://www.americanprogress.org/issues/security/reports/201...
> The murder of 11 Jewish worshippers at the Tree of Life synagogue in Pittsburgh more than four months ago was the most deadly U.S. domestic extremist attack since the Oklahoma City bombing in 1995, but it was far from an isolated incident. The University of Maryland’s Global Terrorism Database showed that, from 2010 to 2016, right-wing inspired terrorist acts in the United States have grown from 6 percent of total domestic terror attacks to 35 percent. The Anti-Defamation League’s report, “A Dark and Constant Rage,” catalogued 150 right-wing attacks from 1993 to 2017, noting that “right-wing extremists have been one of the largest and most consistent sources of domestic terror incidents in the United States for many years.”4 The Center for Strategic and International Studies also reported that, between 2016 and 2017 alone, right-wing inspired violence had quadrupled in the United States.5
Do I need to quote anything more from the first page of a google search for "right wing extremism in the united states" or is that enough?
This is despite the the treaty of versailles having large and well understood economic impact and crushing costs of that treaty. Those costs and consequences are largely understood to have driven the economy into the ground.
Edit: after reviewing some charts, I don't think causality has been established. The high influenza mortality was probably a result of pre-existing economic and political inequalities.