rightly so

rightly so (not comparable)

1. fairly, justly, correctly; understandably so.
   • 1966, Insight and Outlook

     The causes of student unrest, both here and in Europe, have been probed by many; critics bewail, and rightly so, the effects of a generation of permissiveness and Spockery.

   • 2011, José Saramago, History of the Siege Of Lisbon, page 32:

     […] having been ironically reprimanded for inventing ingenuous errors, [he] will have to allow the errors of others to pass, when what he is tempted to do, and rightly so, is to fill the margins of the page with a flurry of indignant deleaturs […]

   • 2021 July 6, Phil McNulty, “Italy beat Spain on penalties: 'Pure theatre as Italy present formidable obstacle in final'”, in BBC Sport‎^[1]:

     Italy's progress throughout Euro 2020 has been gathering momentum from their opening win against Turkey and after overcoming Belgium and Spain in the knockout stage they will fear no-one and rightly so.

• with good reason