Fascism didn't suddenly become popular. It's not popular. Except with the bottom 15%-25% of shitheads who would vote for anyone that promises to hurt their perceived enemies.
What has happened is that liberalism has failed. It has been a planned failure, happening in stages for the past 40 years, at least, wherein institutions and the very concept of liberal democracy have been hollowed out to make room for the cancerous wealth of white billionaires, fascism's most ardent supporters.