This is not a one and done type of tip and is highly situational.

You're right in that you never owe someone something, but just because a relationship ends doesn't mean that the two people do not love/care for each other legitimately, they may have just outgrown each other, or may have found that they have different goals in life that they're not willing to give up.

I would not provide this opportunity in cases where a person is known for being emotionally manipulative, or potentially dangerous.

I would provide this opportunity in cases where the love is still there, there is no [or very little] chance of falling back into the relationship, but where I still wished for the best for that person and cared about them.

Of all my relationships over the years, there is only one ex that I am on bad terms with for being an emotionally manipulative and toxic person. She got only exactly what she deserved, which was absolutely nothing. Everyone else? I wish them all the best in life, and even early in the "breaking" would do what I could to make it easier.