More at https://www.philosophytalk.org/shows/logic-regret.

A teenager decides, on a whim, to conceive a child. Even though we might say that this decision was irrational, she cannot regret it later, because raising the child eventually becomes the most important part of her life. Cases like this show how complicated regret is: that an action was irrational or wrong doesn’t necessarily imply that we should regret it. When, then, should we regret? For that matter, why should we regret anything at all? Doesn’t the feeling of regret just add more pain to circumstances that are already unfortunate? How can it possibly be rational to affirm actions that one knows were wrong? John and Ken don't regret talking to Jay Wallace from UC Berkeley, author of "The View From Here: On Affirmation, Attachment, and the Limits of Regret."