Here is Thomas Jefferson’s prioritized belief structure as found in the DOI:
God
God created
God created man
God created man equal
God through natural law, has granted man inalienable rights
These are therefore “self evident”
and “we hold these truths” AKA absolutes.
Truths which need to be held imply a need to protect them. To protect them against “artificial rules” was his phraseology.

And he said and our forefathers said many times of His proclamations “In The Year OF Our Lord”
He was a deist in youth, personally grappling with Jesus authority for his life, but not His divinity and wisdom, but one that was Christianized by default. But as it is with all men, we draw near to our deepest honesty as we near the veil of death:

“Of all the systems of morality, ancient or modern, which have come under my observation, none appear to be so pure as that of Jesus.”
Letter to William Canby, Sept 18,1813 ~Thomas Jefferson 70 years old

“Had the doctrines of Jesus been preached always as purely as they came from his lips the whole civilized world would now have been Christian”.
Jefferson’s letter to Benjamin Waterhouse June 26, 1822 79 years old

History is a beautiful topic that has many amazing people in it. All of those people had ideas that were disgusting. That doesn’t discount all of their ideas. What’s more, it doesn’t indict other people who find their ideas fascinating. To attempt to do so isn’t being “irreverent”. It’s being cowardly.

That’s true of everybody, whatever their philosophy or politics. Sometimes something works, sometimes it doesn’t, but the idea that there’s one answer or idea that will always work under any circumstances or with any problem is naive.

But a lot of these people weren’t trying to “do” much of anything political. Plato wasn’t trying to force humanity into a utopian pattern. Probably More wasn’t either. Their “utopias” were blueprints for some near future. They were trying to make a point about philosophy or values.

Kant was primarily concerned with thinking about thinking. Such political ideas as he did have weren’t totalitarian. Schopenhauer really wasn’t much concerned with politics at all. Keynes was consummately political, but hardly totalitarian or truly left-wing.

Freud saw therapy as an answer, but was certainly very skeptical of political solutions and utopias. That’s the other side of a lot of the thinkers mentioned here. Foucault, Derrida, Habermas, Adorno, (who wasn’t Horkheimer’s lover for heaven’s sake) had their skeptical side — skeptical not just about religion, say, but also about political solutions. That’s something conservatives may not want to recognize, but it’s there. Maybe conservatism would be deeper or richer or at least more gracious if we recognized that.

Also, do you think you could list any more Jews as belonging to the evil socialist left?