rightly so

Adverb

rightly so (not comparable)

1. In a manner that is factual or just; correctly, fairly, justly, truly; also, in a manner acceptable or excusable in the circumstances; understandably.
   • His name is hight Pollente, rightly ſo / For that he is ſo puiſſant and ſtrong, / That vvith his povvre he all doth ouergo, / And makes them ſubiect to his mighty vvrong; […]1596, Edmund Spenser, “Book V, Canto II”, in The Faerie Queene. […], part II (books IV–VI), London: […] [Richard Field] for William Ponsonby, →OCLC, stanza 7, page 198
   • [T]he victor does not acquire the regal rights even of a conquered and captured King, unless he has won those rights by arms also or has obtained them by agreement. […] The same must be admitted if it be an absolute monarch who falls into the power of his enemy, as Bazajet [i.e., Bayezid I] fell...1916, Johann Wolfgang Textor, “Of the Rights of a Victor over the Vanquished and Their Property”, in John Pawley Bate, transl., Synopsis of the Law of Nations, volume 2 (The Translation), Washington...

   Synonyms:

   with good reason