It was diplomatic in case he would accept the condition but...
It was diplomatic in case he would accept the condition but after establishment of his government, he would act in his own way and would follow his own path. Did 'Uthman, who accepted the condition, follow their steps?! It the Imam acted diplomatically, he shouldn't have treated the opposition, especially Talha and Zubayr who were plausible figures and Mu'awiya who was influential in Sham (Syria), the way he did.
He should have compromised for the moment and fulfilled their demands but after the establishment of his rule, he should have begun to extirpate them. But he didn't do so, and there were many similar occasions in his political life that Ali (a.s.) avoided diplomatic contrivances. The Imam's insistence on moral and Islamic values created problems in establishment of his authority and dominance, and made him encounter serious hardships.
Before everything else, we refer now to the words of Ibn Abi al-Hadid in this respect: Know that a group of those who do not realize Amir al-Mu'minin's superiority, regard 'Umar as more diplomatic than him, although they view him as more knowledgeable than 'Umar.[^1] Ibn Abi al-Hadid goes on to say: In his Al-Shifa', Ibn Sina has confirmed this, and our master had a liking toward this (subject) and dealt with it in his Al-Ghurar.
Also his enemies and opponents presume that Mu'awiya is more diplomatic and his management is more proper than Ali (a.s.)'s. ^2 What follows here for the sake of brevity, is a general response to all criticisms made about Imam Ali (a.s.)'s policies. However, detailed responses are presented in reply to individual questions in the following chapters. The most important point in response to this issue is the emphasis on the way in which politics and government is looked upon.
If politics is viewed as a means of ruling over hearts, or interpreted as ruling on the basis of people's rights and real needs of society, and if we look at Ali (a.s.)'s stances from such perspective, then we will realize that Imam Ali (a.s.) is the greatest statesman in history second to the Holy Prophet (S. A.
W.); but if we consider politics and statesmanship as a means to achieve power and domineering or interpret it as taking advantage of people and exploitative domination over them, then the Imam's stances are not defendable.