These razors embody present day dichotomies. For example; to be clean shaven would imply to have shaved. But it would also automatically imply that you aren't hairy.
Human attributes are often in discourse talked about in the same way. That one attribute should exclude another.
Therefore you can not be worried and rational at the same time(?) This is not true.
A dichotomy is a partition of a whole. In other words, these couple of parts must be mutually exclusive: nothing can belong simultaneously to both parts.