The fear in itself might not be totally irrational, in the sense that it seems beneficial to have the capacity for this type of fear (for evo psych reasons, etc

The fear in itself might not be totally irrational, in the sense that it seems beneficial to have the capacity for this type of fear (for evo psych reasons, etc.) However, I'm sure you'll agree that the fear in its context is irrational (which is what defines it as an anxiety disorder).