Because it was about the origin of species, not of life. I see you never actually READ the book, or you would have known that. The book is about how species come to be from existing life. Without a previously existing imperfectly self-replicating organism, evolution can't happen. Darwin specifically says in the Origin of Species that the origin of life is outside the scope of his theory.
So, either you already knew this and felt the need to lie, or you are woefully ignorant about Darwin and felt the need to denigrate a book you never read.
That begs the question, species are begat of life.
Why did darwin and modern supporters leave that out.
Science appeals to the truly conservative mind for the same reasons that free enterprise does. It's reality-based, it focuses on what works, it rejects failed concepts, and it produces results. American conservatism, which seeks to preserve and build on the wisdom of the Founders, is inherently rational at its intellectual base. No one can read the writings of Jefferson, Franklin, and the other Founders without immediately coming to that conclusion. This is also true of the Framers of the US Constitution. The conservative movement in America is and always has been rational. Any assault on rationality is not only anti-conservative, it is also anti-American.