I think it has to do with the anachronistic nature of conservatism. Basically, conservatism is medievalism (monarchy, imperialism, patriarchy, slavery, feudalism, mass ignorance), so it's always been at odds with the secular humanistic basis of modernity. I'll be saying more about this in relation to Project 2025. But I've written a long series on conservatism, which is summarized here:

https://medium.com/grim-tidings/telling-the-brutal-truth-about-conservatism-89984745f17?sk=174085419fe90365a3544149dc494c58