Conservativism has nothing to do with "conservatorship". They are not trying to conserve, they are trying to force radical change - sometimes to imaginary past and sometimes toward something completely new. And then violently keep it there regardless of needs of other people.
There’s the “let’s create National Parks to conserve our natural treasures!” conservatism and there’s the “let’s sell our National Parks to the highest bidder so they can drill for oil!” conservatism. It can mean fiscal responsibility and small government, or it can mean crypto scams and surveillance state.
This happens a lot when describing political positions.
What is called conservatism in many countries today is totally different from what it was while Heinlein was alive.
Conservative voters do not care about freedom, conservative politicians do not care about freedom and and considerable amounts of them are actively opposed to it.
Conservativism is consistently very authoritarian. It is about hierarchies, not freedom.
They have known political program and agenda. They vote in congress, senate and general election. They write articles, they have tv shows, podcasts and radio shows.
They are consistently pro-Trump, pro-authoritarian, pro-war, anti-abortion, anti-whatever-not-them groups rights. Except big business, they are pro big business.