There are rights and then there are rights. It's pretty easy to see the characterization of "free speech" as rooted in reason / "natural law", or given by God. It's harder to see the "right" to drink alcohol on such universal bases.

Something like legal representation isn't so much deeply fundamental as it is a pragmatic and institutional response to the problem of checking arbitrary prosecution. We would drop it if we could find some better way of checking those prosecutors.