Totalitarian regimes flourish "ad extra" - winning converts to their Utopian cause thanks to normally brilliant (and monopoly) propaganda ministries. Commies were brilliant in keeping each local city or town convinced that the Revolution "was really going great guns somewhere else"... that all the bad news was only a local abberation, not the generalized condition.
But ad intra, while they also were masters at scape-goating and show trials, convincing their captive audience that any bad result was exclusively the result of enemies of the state, not the incompetance or malign intentions of the state and bureaucrats themselves.... their very real anti-human tendencies to crush opponents without mercy eventually leads to large numbers of captives who know the truth about their teeth of steel hiding behind smiling faces.
Only once a sizable majority of people outside and inside the system realize that the propaganda is BS do conditions allow a change to the system. When they have to start defending the indefensible both to would-be converts as well as growing numbers of "the people" they claim to champion, the wheels come off.
In our country the Left has a stranglehold on public education, Academe, the arts, MSM, and now the Democratic party. But they DON'T have a monopoly on education as millions of students are either home-schooled or attend private schools.
They DON'T have a monopoly on Media outlets either - which is why they lose elections. Give it some time. Most Leftists are dying out (literally) thanks to their "lifestyles", low birth rates, and inability to attract young people in sufficiently large numbers TO THEIR IDEOLOGY.
THEY DO do a fine job corrupting the youth to their MORALITY...but that doesn't always translate into political action much less organization as they discovered in 2004.
Finally, let's not get carried away with scape-goating "Democrats" per se. Lots of RINOs are "evil" too on some issues. Power is corrupting - and addictive, perhaps more than any drug. Gaming the system is so easy for some people that a serious challenge via ballot box is considered an act of war against their whole world view. Politics was always dirty but nowadays anyone running for serious, federal level offices needs deep pockets, impeccable credentials and lots of lawyers.
To wield the kind of power Senators and Judges have without abusing it or the common good requires grace and extraordinarly human virtue.