"Here's what's wrong with diamonds:
I don't have enough diamonds!"
What does love have to do with rightness?
We do for love what we would not otherwise do. We do right for love. Love compels a person to do right. It drives us to higher standards of rightness than we might otherwise embrace. Love inspires rightness -- for love's sake, for the sake of the beloved.
Also, love is what's right. It is right to love.
So, what does love have to do with rightness? Everything. Rightness and love are inseparable. There's nothing wrong with love, nothing at all. The only thing wrong with love is the lack of it, or the insufficiency of it. Which is exactly like saying, "Here's what's wrong with diamonds: I don't have enough diamonds!"
Love is perfectly Right.
Such is the connection between Love and Rightness.