Did he say why he believes this is the best remedy, and is his position backed up by any evidence from psychology, memetics, etc? The evidence I'm aware of lead

Did he say why he believes this is the best remedy, and is his position backed up by any evidence from psychology, memetics, etc? The evidence I'm aware of leads me to the opposite conclusion. Also he wrote this before social media. He wrote that before fascism swept in on the back of free speech and public persuasion in the 1930s. We're in a new paradigm now and worldviews need to be updated to fit new information and new evidence than what was available during his time.