I am assuming life is normally valuable but reason is in a more fundamental category altogether. Regardless of the value of life, to reject the value of reasoning is not only self-refuting but also self-destructive. It implies reasoning is a waste of time and energy but ask yourself how we reach that conclusion? By chance?
Science is not the sole arbiter of reality. The best best of any theory is its fertility, coherence and consistency with the way we think, behave and live. Only a lunatic acts as if life is valueless. People who commit suicide are consistent if they believe live is not worth living but the vast majority implicitly acknowledge the immense value of life by continuing to stay alive in spite of all its drawbacks. It was an atheist without an axe to grind (Thomas Nagel) who pointed out that life is valuable because it is a source of opportunities… Pragmatism is not the sole criterion of truth but it is one of them…
Why you’re talking about reason and reasoning, I don’t understand. Or your talk of value. Value is a huge topic that’s tangential to most moral philosophy. I know it’s a popular slogan used by the apologists at Catholic Answers and they make for nice soundbites on the radio show. I’m not saying that reason isn’t good, in a moral sense. (Though I’m not sure how reason ITSELF could be one thing or the other. Perhaps USING reason could be a moral good?) I’m saying that give me your laundry list of scientific facts about reason and reasoning - cognitive science has things to say on the subject. You still need the logical connection between “X uses reason” to “the use of reason is good” even if the normative proposition is an unstated premise.
If you abandon reason you are contradicting yourself. How can you distinguish between what is logical and illogical without the power of reason?
Anyway, I think we’ve gone off the tracks. My first paragraph is why I originally stated that science can be useful in informing morality. For instance, we might both agree that causing undue pain is morally wrong. There is debate whether lobsters can feel pain the way we humans do. The science on that subject will help us discern if boiling lobsters for our expensive surf’n’turf dinners are morally wrong as the evidence can tell us whether the lobsters are dying in horrible agony or not. Science is very important in the doings of philosophy, and vice-versa.
Science is subordinate to metascience, e.g. metaphysics, logic and epistemology which provide its foundations. It presupposes the intelligibility of the universe and the validity of intelligent activity. Its role is restricted to physical phenomena and human behaviour which is only partly explained by biological facts.