Multiple factors.

• Thanks to incessant propaganda, and spineless “democrats” engaging in false “tolerance” towards the intolerant, the entire political spectrum has shifted towards the right a fair bit.
• The overall decline of journalism
  • Facts are a thing of the past, everything is treated as an opinion. Instead of researching and reporting on facts, it’s way easier to simply parrot opposing “opinions” and pretend it’s balanced reporting.
  • Engagement and attention Outrage driven, mostly ad funded “journalism” where the most outrageous piece generates the most clicks and therefore revenue
  • Shallow click bait journalism will regurgitate every piece of shit that comes out of “social” media, which pioneered outrage driven (and driving) algorithms
  • Corporate media owned by people who think they will profit from and therefore support fascists with outright propaganda
• The success of the fascists and media circus inducing spineless “democrats” to cater to the extreme right, in order to (typically unsuccessfully, because why vote for a cheap copy if you can have the real deal) fish for votes in the fascist cesspool of hatred shifting the political spectrum even further.
• The right shift is a self accelerating feedback loop, it normalises views, which were unthinkable to civilised people only a short time ago.

This unfortunately is a phenomenon that’s pretty global. This time, there is little chance of any outside help against fascists gaining power, because barely any country will be spared from that fate.