The contrast is of ideas: It is not logical to be afraid of things when there is danger (and therefore there should be no such things as phobias ) but (there are such things as phobias because) a phobia is not logical.
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Persian LearnerYou mean It is logical to be afraid of things when there is danger,Just the opposite.
DAvictorIDLet's shorten and rephrase it to show by example: To fear things that are not a danger is regarded as being a phobia because the fear is not logical BUT if they are dangerous it is logical to fear them and therefore not a phobia.Unfortunately, that's not what the original said.
Persian LearnerIt is not logical to be afraid of these things when there is no danger, but a phobia is not logical.Compare: