As I said the point is we consider them as Imams , I mean we believe that Ali (a.s) and his descendants are the Imams and successors after the prophet (pbuh), and we need to follow them ... their aim was protecting Islam not power that's why imam Hussain sacrificed himself and his family his blood and 72 of his followers saved and guaranteed Islam forever :
Ali (a.s.) says: "'I was surprised to see the people pour unto that person to give him bay'ah; so I held my hand, until I saw the people heading backwards and turning from Islam, calling for the annihilation of the religion of Muhammad (p.), so I feared that if I did not support Islam and its people, I would see its breakage and demolition, a disaster for me which would be greater than losing my rule over you, which was after all only few days long, and that it would vanish as a mirage vanishes or clouds disperse ". And in another situation he said: I will remain peaceful as long as the affairs of Muslim are secured.
they then dragged Imam Ali (AS) out of the house, putting a noose around his neck, dragging him through the streets of Madinah to force him to make Bay'ah to Abu Bakr!!! When they reached Abu Bakr, they grabbed hold of the hand of Imam Ali (AS) and forcefully touched it to the hand of Abu Bakr, and then shouted that Imam Ali (AS) has made Bay'ah with Abu Bakr!!! People like Salman al-Farsi and Abu Dharr al-Ghefari shouted by Allah Imam Ali did NOT make Bay'ah willingly. Imam Ali (AS) told everyone that the Caliphate is his right only, as Rasulollah (S) had appointed Imam Ali (AS) as his successor on specific instructions from Allah Almighty. He repeated this throughout the rule of the three rulers Abu Bakr, Omar, and Othman, and the Muslims freely, and for the first time, made Bay'ah with Imam Ali (AS) as the Caliph of Rasulollah (S), even then he stated that it was his right to be the caliph of Rasulollah, and it was every Muslim's duty the make Bay'ah with him, Imam Ali as Amir-ul-Mu'minin, if they believed in Allah and His Messenger.
After the martyrdom of Rasulollah, the Muslims did not honour the Bay'ah they had given Imam Ali (AS) on the day of Ghadeer Khum on the orders of Rasulollah (S). The correct thing to do was to adhere to the Bay'ah the Muslims had given Imam Ali (AS), and Imam Ali (AS) challenged everyone to prove otherwise, and stated that the truth - the Haqq - was to do what Allah and His Messenger had ordered the Muslims to do
they would have killed Imam Ali (a.s) if he hadn't given the oath of allegiance ... remember the verse :
"O Apostle! Deliver what has been sent down to you from your Lord; and if you don't do it, you have not delivered His message (at all);
and Allah will protect you from the people ..." (Qur'an 5:67)
11 out 12 of Imams were martyred , the last one who is Imam Mahdi is believed alive by shie Muslims as the prophet (pbuh) prophesied one they he and Jesus Christ will come to bring the justice to this world ... got it ? it's not something about history .... it's about future ... and he is one of the descendants of Imam Ali (a.s) ....
that's why it's important to know who is the real successor after the prophet (pbuh) , he must be appointed by God as his last prophet was .
A class(world) without teacher(a prophet or successor appointed by God almighty ) doesn't have an exam by the end of the term(judgement day) , who is our teacher ?
first of all be polite , then :
Ummu Salamah r.a., the Prophet’s (pbuh) wife, said that Fatimah r.a. is the person most similar in word and thought to the Prophet (pbuh). As a daughter, Fatimah r.a. also loved her father more than anyone else in the world. After her mother Khadijah r.a. died, she was the one who cared for the Prophet (pbuh). She was only 6 years old at the time. She always made an effort to take over her mother’s role. She was the one who bandaged the Prophet’s (pbuh) wounds and made him happy. As a result, the Prophet (pbuh) nicknamed her Ummu Abiha, her father’s mother, for the love and noble sacrifice she showed towards her father.