As mentioned before...
As mentioned before, if he were to be killed, his death would mean the death of a rightful leader. This in itself was an issue which even Imam al-Husayn refrained from: that no one in the position of prophet or a vice regent must be killed. We see that Imam al-Husaynis not willing to get killed in Mecca, Why? He said: it would be the respect for Mecca that would be destroyed. They will kill me anyway.
Why should they kill me in such a place of sanctity, which would only cause disparagement to the House of Allah? We see that during the rebellion against ‘Uthman,2 ‘Ali is trying extremely hard to respond to their demands in order to stop ‘Uthman from being killed (this has also been mentioned in the Nahj al-Balaghah). He defended ‘Uthman to such an extent that once he said, “I have defended ‘Uthman so much that I have fears of being sinful for it.”3 But why did he defend ‘Uthman?
Was he a supporter of ‘Uthman as a person? No. The extent of his defence was explained when he said: I fear that you will be ‘the assassinated caliph’. It would be a disgrace for the Muslim World to have a caliph of the Muslims killed during his time at rule. It will be considered as disrespect to the caliphate as a whole. This is why ‘Ali said that they have lawful demands. He advised ‘Uthman to fulfil their demands so that they go back to where they came from.
On the other hand, ‘Ali did not want to give the rebels the expression that they should go about their business, forget about the truth and not complain about a situation that was getting worse by the day, even though it would inevitably mean more power for a ruler who was being obdurate. Of course, he would never say these words and he should not have. But at the same time, he did not want ‘Uthman to get killed while he was still in power. At the end, in spite of ‘Ali’s desire this took place.
If Imam al-Hassan had resisted then, from what is apparent from history, the final result would have been getting killed, which means the death of the Imam and the Caliph in power. Imam al-Husayn’sgetting killed was the death of a protester. This is one difference between Imam al-Hassan’s circumstances and Imam al-Husayn’s. The second difference was in connection with the weakening of Iraqi forces, i.e. the forces in Kufah, which is true.