To add on to the people pointing out that science is data:
Yes, it is incredibly obvious that the turmp fanclub subreddit would radicalize people to become white nationalists.
What is not obvious is that this is happening everywhere. And, if you get a hold of one of the "leaked" white supremacist recruiting guides from the 80s and 90s, that is by design.
South Park Libertarians and all but it really is telling how many people, to this day, insist that the f-slur for gay people is really "Oh, we took that back. it means obnoxious motorcycle drivers". Let alone statements like "har har, you are so butthurt" that (regardless of what urban dictionary says) are on the same level as "ha ha, you are gay"
We see it every day. And it makes communities hostile. And if you call it out, you get driven out. Which means there are fewer people around to say "... what the fuck? How can we think this is acceptable?". And then someone whose entire vocabulary is "lolzors go woke go broke pepe pepe" gets rightfully made fun of elsewhere and now they are a victim and all those "for the lolz" become their identity.