“Furthermore, without advance notice to the Passenger or purchaser, Southwest may cancel such reservations, or any other reservations that it believes, in its sole discretion, were made without intent to travel."

If you have 2 flights A-B booked 24 hours apart and plan to cancel one or the other of them depending on how your day works out, then manifestly you do not intend to take the other.

And “sole discretion” has a meaning.

Seems pretty clear to me.

And on the off chance you are a courier or some such
who flies back and forth daily, contact WN and tell them.