1.) Take natural selection as the paradigm “brute fact” that can account for the initial conditions carried forth by laws.
2.) Selection is a happy accident of a mutation finding an environmental fit conferring reproductive advantage. It is a game of chance whose outcome can be expected if we just get enough tries. Finding the password is just a matter of taking enough attempts.
3.) But a machine randomly trying passwords until it hit on the right one is a code cracker. This is particularly a propos to selection. The mutation of bacteria is their one defense against antibiotics, and the mutations of microorganisms in the face of our genetic modifications resembles nothing so much as an attempt to pick the locks we have placed on plants. If not for the mutation, to find one defeater of a species would be the absolute doom of that species. Mutation and reproduction are thus both species-level survival systems, with mutation being the redundant system.
4.) Mutation provides the same species-level good as reproduction. Mutation often fails, but so do almost all attempts at reproduction (the success rate of seeds is comparable to the success rate of mutations.)
5.) Reproduction differs from mutation in that the former requires complex structures while the latter does not. Mutation occurs only because of the absence or imprecision of the system that might check for it. It is this absence of a system that allows for it to be mistakenly understood as a brute fact.
6.) Mutations arising from the absence or imprecision of the system is defined relative to species-level goods in the same way reproduction is.
7.) And so the paradigm case of an originating fact in nature is defined relative to species-level goods, i.e. common goods.