Somewhere along the line authoritarianism is needed to govern.
Whatever form it takes, whatever handle you put on it, Government, ultimately, is power: Power to make rules and power to enforce them.
Without that you might as well have a knitting circle.
The Founders recognized this and have attempted to channel that power from the consent of the governed through a system replete with limiting Constitutional constraints and few, narrowly specified duties.
If absolute power corrupts, it is best to limit power to limit corruption. As governmental power grows (outside the constraints) the corruption continues and expands, and ultimate power means ultimate corruption (and a heavy hand to enforce it) yielding totalitarianism.
It matters not which -ism (communism, Fascism, Socialism, Islamism, etc.), the net effect of all is the same; that being the concentration of power in the hands of a few, and the disempowerment of the many.
While some isms give the illusion that the people are getting more power, as soon as the mobs are dispersed (through whatever means), those -isms reserve the power to a few and brutally enforce the wishes of those in power. That includes abusing, enslaving, and killing off opposition.
Our precept, our fundament as a system was to thwart the development of such -isms as viable political forces, to leave those options off the table, to have an educated populace which would reject them out of hand. Unfortunately, over the past half century, our entire system of education has been subverted, even hijacked, to program its students to believe that those -isms are truly attractive, without providing the historical context of the inevitable endgame of those systems, the systematic slaughter, enslavement, and subjugation of those who think they have anything to gain.
When we let down our guard (like we did when Communism was declared 'dead', even as its roots were infiltrating our own culture), we become vulnerable to the deception necessary to emplace such systems.
Yes, we are ever at risk. There will always be those who seek to gain at the expense of others, who lust for power, and who will not care how deep they stand in the blood of fellow humans to achieve it.
Those being thwarted in emplacing those -isms will be the first to point the finger of accusation at those who seek to retain their freedom and continue to practice their God-given Rights and claim that they are the very thing they, themselves seek to impose on the rest of us.
Eternal vigilance is the price of freedom.