We conclude that conspiracy mentality is associated with extreme left- and especially extreme right-wing beliefs, and that this non-linear relation may be strengthened by, but is not reducible to, deprivation of political control.

To add to this, radicalism spreads thru a social contagion effect and requires repeated reinforcement, and social media acts as a catalyst. However, local organizing also plays a vital role in the spread far-right extremism.

Here is an article I have written on my blog detailing how people become radicalized. I have ads turned off and do not benefit in any way from my blog.

One important section I'd like to share here is for the false 'both sides' arguments:

  There is a stark difference in the means with which the two groups engage in acts of extremism. In a study evaluating Left-Wing and Right-Wing domestic extremism between 1994 and 2020, there was one fatality as the result of Left-Wing extremism, versus 329 fatalities resulting from Far Right extremism in that 25 year period. [5]

   The Far-Right movement is the oldest and most deadly form of domestic terrorism in the United States, and The Anti-Defamation League Center on Extremism found that the Far-Right is responsible for 98% of extremist murders in the U.S. [24] Furthermore, for nearly every year since 2011, Far-Right terrorist attacks/plots have accounted for over half of all terror attacks/plots in the United States. [21]

   In the U.S., Right-Wing extremism was responsible for two-thirds of all failed, foiled, or successful terror attacks in 2019, and was responsible for 90% of attacks in the first half of 2020 alone. [21] Since 2013, Far-Right extremism has been responsible for more terror attacks/plots than the Left-Wing, ethnonationalism, or religiously motivated attacks/plots. [21]

References

That is the finest example of begging the question I have seen in years! It's really rare to see in the wild.