question #2 Sahih Muslim 677j, Book 5, Hadith 387 : Why might the Prophet Muhammad (ﷺ) have invoked curses upon certain tribes, and what does this teach about justice in Islam?

Anas reported that the Messenger of Allah (ﷺ) observed Qunut for one month invoking curse upon some tribes of Arabia (those who were responsible for the murders in Bi’r Ma’una and Raji’), but then abandoned it.