It Aint Necessarily So said:
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I don't think reason can make the choice. It can only tell us what is likely to happen if we choose this way versus that. It cannot tell us which is preferable. I'm sure that you're familiar with the is-ought chasm (Hume's Law). Nothing about how things are or could be tells us how they ought to be.
Here's my reasoning:
The judgments of conscience are intuitive signals which operate on pain and pleasure. When it considers an act wrong, we feel it as an unpleasant sensation. When it isn't wrong, we feel nothing.
My experience is that I get a message that something is right or wrong, not just a message telling me that I am wrong when I am.
The pain and pleasure comes after the action. The conscience either affirms one's choice as being consistent with its internal values, which produces the pleasant sense of having done the right thing, or produces cognitive dissonance - perhaps guilt or shame - when we don't heed our inner voice.
In a moral dilemma, when conscience signals that both options feel wrong, it has no way to signal a simple preference. Isn't the weighing of the harm done a simple task for the reasoning faculty?
I still say that reason cannot help us beyond telling us how things are and could be, but not what we ought to do.
If we have prior experience with this choice, it can remind us of what we did last time and how that turned out. We may decide to test the alternative this time, and create a second memory that may be useful if the dilemma presents itself a third time, at which time, once again, reason can inform us of how things are - choose A and feel mental state 1, or B and 2
If conscience cannot inform us of the right choice, then we must just guess which
I understand the ought-is concept but I don't see how it applies.
I don't know how to rephrase this.
There are two different and independent types of mental activity going on in this process, one by a faculty we call conscience that answers
normative questions, and another that solves problems using the senses, memory, and, if we are sufficiently trained in the process of critical thinking, the ability to go turn valid premises and evidence into accurate predictions about how various choices might or will work out.
The first is the "ought" part, the latter the "is" part. We need them both to make rational choices that produce the outcomes that we value. If we don't use reason, however good our values are, we are less likely to get the outcomes that they suggest that we should seek. Assuming that we have healthy consciences, if we don't heed their counsel, we probably aren't making moral choices, and can expect pangs of psychological pain to follow.
It's the skillful and successful interplay of the "is" and "ought" faculties that leads to right behavior and a sense of moral rectitude.