What is (should be) the primary goal of conservatism?
The preservation of humanity's independent spirit. The promotion of individual liberty. To moderate our innate desire for creating permanent and perfect monuments of idealism that are inevitably corrupted by an imperfect humanity.
Select any issue and try to achieve a solution that preserves our independence of spirit, and which is sustainable without the expectation that humans will act ideally to ensure the solution's practicality in perpetuity. We must be willing to try solutions and reexamine the results and adapt. What humanity can build is always imperfect. Our Founders understood this. They gave us a system that balanced power between multiple generations, as well as between opposing ideologies.
Conservatism is the preservation of the system that utilizes the conflicts of human self-interest to achieve the balance that ultimately preserves our individual freedoms.
Idealism has given us the New Deal and the Great Society, and both have failed. Idealism gave us the notions of the Noble Savage, and the Sainthood of Victimhood - and both have damaged generations of Native Americans and African Americans. Idealism gave us Communism and Marxism, and the tens of millions of victims of those failed ideologies.
Conservatism asks two questions. "Is it good?" and "Is it worth the cost?"