It doesn't jump straight to that. The intermediate steps usually involve one or more of:
1) A political ideology (Nazism, Communism, Islamism)
2) A real external threat (Communism, Capitalism, Islamism)
3) Sanctions or economic depression (Weimar Germany, Russia today)
The real external threat is essentially a sociopolitical system that propagates itself inside the turf of another sociopolitical system. This leads to far-right war hawks, and then center-right, issuing xenophobic statements. The step before "supporting supreme leaders" is usually "suppressing enemy ideologies". Like McCarthyism in USA or anti Muslim sentiment today. Or Iran's hatred of the USA and the Shah prior to their revolution. Or Soviet hatred of capitalist bourgeouis. Or Ukraine's hatred of communists. And so forth and so on.
Once "the enemy" is identified, the crackdown begins, which leads to more clamps on civil liberties. Then you might want to read the poem attributed to Martin Niemoller:
https://en.m.wikipedia.org/wiki/First_they_came_...