A thought occurred to me as I was reading your comment: what if this thinking that what we're witnessing couldn't happen in "advanced Western democracies" that are not "socially backward, ideology-riddled, [and] far-off" is one of the factors that helped us get to this situation?
All societies have "socially backward" and "ideology-riddled" aspects to them. American society has long struggled with racism, xenophobia, sexism, and anti-intellectualism, just to name a few of these ills. For example, the Eisenhower years that many people consider America's peak were also years where African Americans still had to endure Jim Crow, though to be fair this era was also the beginning of the Civil Rights movement, were many people fought to secure civil rights for all Americans regardless of ethnicity. McCarthyism and J. Edgar Hoover's abuse of authority were also happening under these times. Nixon had his infamous "enemies list." Police brutality and the violent suppression of non-violent protests have been an ongoing problem. Speaking as an American, our nation has been far from exemplary when it comes to not destroying political "enemies," from whistleblowers to protestors to entire ethnic groups.
Granted, the federal government has been able for much of its history to avoid fully caving to the desires of the "socially backward" and "ideology-riddled." Unfortunately, demagoguery is sometimes an effective strategy, and to be frank, our oligarchs and our politicians in general have done a poor job since the 1970s of building an environment where everyday Americans have an opportunity to improve their material lives. The past 30 years in particular have been a bonanza for asset holders, successful entrepreneurs, and other well-connected people, but it seems that life has become harder for the average low-income and middle-class American, especially as the prices of health care, higher education, and housing have gone up far faster than many Americans' ability to pay for these things. This has left behind many people, and many people feel like the "American dream" is dying or even dead. Unfortunately this hopelessness is a breeding ground for "socially backward" and "ideology-riddled" thoughts to take root, and the resulting field has become ripe for demagogues to pick.
We are now dealing with the results of this. Democracies are not immune to this; similar political movements in France and Germany have been picking up steam in recent years.
I don't know how we could reverse the tide in America right now, but I hope and pray that this does not spread to places like Canada, France, Germany, and other stable democracies. I think the key lies in having leadership, not just governmental but also in business and in other social institutions, be more caring about the societies they are established in. It's much harder for demagoguery to be effective when people feel secure and hopeful about their lot in life.