Mass propaganda and some reeeeeaaaaalllly stupid people.

The parties in power are failing to address the problems ordinary people are facing. Problems like the excessive immigration of people from Asian countries, the insane housing prices, rising cost of living etc. People are looking for alternatives.

These extremists know exactly what the problems are and how to talk about them. They also know better to meet people where they are, like on social media. To most people who are ignorant of politics, these parties seem to solve all their problems.

And let's be real, half the population is below average intelligence. Way too many people don't realize or even worse, don't care, about what these parties are really about.

Pretty much the same propaganda "package" is being used all over the world.

Governments work hard and spend billions of public money to try to stay in power, they spend these in modern and technological warfare too.