Ideas like fascism rarely spread because they’re better. They’re simpler which makes them more appealing. Better ideas also tend to be less appealing on the face of things because they’re more complex.

But that doesn't explain its popularity; other ideas are simpler than fascism and don't spread. Fascist leaders gain an audience because they address concerns which their opponents (liberal globalists) won't bring up, for fear of alienating their own support base. Fascism may not be the right solution, but dismissing its supporters as too simple-minded to understand complex ideas doesn't help advance a better alternative.