I have had the strong sense that 'conservatism' has largely failed as an intellectual and political movement; it has not in fact conserved anything successfully, leading us to a moment in which something more counterrevolutionary may be needed. However, I came across a
2016 post by Tom which cited a few core tenets:
1. An objective moral order
2. The human person as the center of political and social thought
3. A distaste for the use of state power to enforce ideological patterns upon human beings
4. A rejection of social engineering, or the "planned" society
5. The spirit of the Constitution of the United States as originally conceived, especially the division of powers between state and federal governments and between the three branches of the federal government
6. A devotion to Western civilization and an awareness of the need to defend it
I definitely believe that there is an objective moral order, one that is discoverable in nature -- for example, one discovers that the virtues Aristotle praised are in fact the things that make your life better if practiced. That is simply true; and yet the idea that one should draw ethical lessons from nature, even or especially human nature, is very much under attack.
I'm not quite sure what the alternative to proposition 2 was intended be; perhaps the preservation of an institution, such as the Church or a city-state? I would say that this proposition is shared by right and left, though; feminism, for example, is all about the lives of human women (and not, say, lionesses); our cultural disputes are more about whether this or that person's interests should be upheld where they conflict. The dispute about trans-* athletes is really just a dispute about whether their individual interests should trump those of the individual women athletes they might be displacing; it's not a dispute over whether the interests of a person should or shouldn't be the root of the decision.
Proposition three is framed in terms of tastes, which might be right; although it might not be. I suspect many conservatives, if asked, would be happy to resume criminalizing certain sexual practices and/or lifestyles; and some remaining laws banning sexual practices, such as pedophilia, are hotly supported by conservatives. Meanwhile the state sometimes does provide a useful corrective to non-state attempts to impose ideological agendas; people have successfully sued in court to restore rights that were being suppressed by employers or corporations.
The fourth proposition is where the failure is most obvious; the proposition is the right principle, but so far the planners are stealing one Long March after another.
I would submit that the fifth proposition is misguided, although I once held to it. I have decided, however, that it is not the Constitution but the Declaration of Independence whose spirit must be the eternal and unyielding guide. The Articles of Confederation came and went, and the Constitution may do likewise. As long as we hold that 'all men are created equal, and endowed by their Creator with unalienable rights,' and that 'governments are instituted among men (solely) to secure those rights,' and may be replaced whenever they become destructive to that end -- as long, too, as we do not yield our original understanding of what rights these were, to include freedom of speech and thought, religion, the right to keep and bear arms, and the right to be secure from official oppression -- well, that is the thing to be preserved.
The sixth one is true, and never more true than now. A defense is needed.