Rights are not based in need, they are based on what Man is.
"[The Pragmatists] declared that philosophy must be practical and that practicality consists of dispensing with all absolute principles and standards—that there is no such thing as objective reality or permanent truth—that truth is that which works, and its validity can be judged only by its consequences—that no facts can be known with certainty in advance, and anything may be tried by rule-of-thumb—that reality is not firm, but fluid and “indeterminate,” that there is no such thing as a distinction between an external world and a consciousness (between the perceived and the perceiver), there is only an undifferentiated package-deal labeled “experience,” and whatever one wishes to be true, is true, whatever one wishes to exist, does exist, provided it works or makes one feel better." AR, For the New Intellectual.
Nominalism: A concept is a way of categorizing many specific facts, it does not correlate to a specific.
Empiricism:
"[Philosophers came to be divided] into two camps: those who claimed that man obtains his knowledge of the world by deducing it exclusively from concepts, which come from inside his head and are not derived from the perception of physical facts (the Rationalists)—and those who claimed that man obtains his knowledge from experience, which was held to mean: by direct perception of immediate facts, with no recourse to concepts (the Empiricists). To put it more simply: those who joined the [mystics] by abandoning reality—and those who clung to reality, by abandoning their mind." For the New Intellectual