Because I am violating an accepted practice and they are enquiring WHY.
Because I am violating an accepted practice and they are enquiring WHY. Likewise, it is clear common sense that Mu'awiya wanted to know why Sad was NOT cursing Ali (as). This shows that cursing Ali was a common practice and Mu'awiya wanted to know why he was acting contrary to it? If this is not logical then the clearest proof comes from the next narration from other sources of Ahl'ul Sunnah that shed light on Mu'awiya's intention.
Mohibuddin al Tabari in his classical book of hadith Riyad ul Nadira states that "Mu'awiya ordered Sa'd bin Abi Waqqas to curse 'Abu Turab" (Volume 3 page 194). Ibn Hajar Asqalani in his commentary of Sahih al Bukhari "Fathul Bari" states: "Mu'awiya issued an order to curse Hadhrath 'Ali. Upon hearing this Sa'd bin Abi Waqqas said "Even if you place a sword over my head and demand that I curse 'Ali, I will refuse to do so". Fathul Bari, Vol.
1054): "Ibn Hajar Asqalani (w29.2(1)) is Ahmad ibn Ali ibn Muhammad al-Kinani, Abu al-Fadl Shihab al-Din Ibn Hajar al-Asqalani, born in Cairo in 773/ 1372. A Shafii Imam and hadith master (hafiz), he reached the level of Commander of the Faithful in Hadith, the only rank above that of hadith master (hafiz). Known as Sheikh al-Islam, scholars travelled to take knowledge from him, and he was appointed to the judiciary in Egypt several times.
He authored a number of works on hadith, history, biography, Koranic exegesis, poetry, and Shafii jurisprudence, among the most famous of them his fourteen-volume Fath al-Bari bi sharh Sahih al-Bukhari [The victory of the Creator: a commentary on the "Sahih" of Bukhari] which few serious students of Islamic knowledge can do without. He died in Cairo in 852/1449 (al-Alam (y136), 1.178; Sheikh Shuayb Arna'ut; Sheikh Hasan Saqqaf; and A).