Fadak in Islam 9

It appears from recorded historical events, that Lady Fatima (a.s.) was successful at the beginning in persuading Abu-Bakr to hand back Fadak to her; listen to part of a speech according to some historians he delivered after hearing Fatima's speech. He said:
"O daughter of the Messenger of Allah... Surely the Prophet is your father, not anyone else, the brother of your husband, not any other man; he surely preferred him over all his friends and (Ali) supported him in every important matter, no one loves you save the lucky and no one hates you save the wretched.
You are the blessed progeny of Allah's Messenger, the chosen ones, our guides to goodness our path to Paradise, and you are the best of women and the daughter of the best of prophets, truthful is your sayings, excelling in reason. You shall not be driven back from your right...But I surely heard your father saying: `We the group of prophets do not inherit, nor are we inherited Yet, this is my situation and property, it is yours (if you wish); it shall not be concealed from you, nor will it be stored away from you. You are the Mistress of your father's nation, and the blessed tree of your descendants. Your property shall not be usurped against your will nor can your name be defamed. Your judgment shall be executed in all that which I possess. This, do you think that I violate your father's (will)?"
Fatima then refuted Abu-Bakr's claim that the Prophet had stated that prophets cannot be inherited, and said:
"Glory be to Allah!! Surely Allah's Messenger did not abandon Allah's Book nor did he violate His commandments. Rather, he followed its decrees and adhered to its chapters. So do you unite with treachery in justifying your acts with fabrications?
Indeed this act of yours after his departure is similar to the disasters which were plotted against him during his lifetime. But behold! This is Allah's Book, a just judge and a decisive speaker, saying: `One that will (truly) inherit Me, and inherit the posterity of Yaqub,' (19:6) and 'And Sulaiman inherited Dawood.' (27: 16)
Thus, He (Glory be to Him) made clear that which He made share of all heirs, decreed from the amounts of inheritance, allowed for males and females, and eradicated all doubts and ambiguities (pertaining to this issue which existed with the) bygones. Nay! But your minds have made up a tale (that may pass) with you, but (for me) patience is most fitting against that which you assert; it is Allah (alone) whose help can be sought."
It is apparent that Abu Bakr changed the mode with which he addressed Lady Fatima (A) after delivering her speech. Listen to his following speech; which is his reply to Fatima's just reported speech.
Abu Bakr said:
"Surely Allah and His Apostle are truthful, and so has his (the Prophet's) daughter told the truth. Surely you are the source of wisdom, the element of faith, and the sole authority. May Allah not refute your righteous argument, nor invalidate your decisive speech. But these are the Muslims between us who have entrusted me with leadership, and it was according to their satisfaction that I received what I have. I am not being arrogant, autocratic, or selfish, and they are my witnesses."

Upon hearing Abu-Bakr speech of the people's support for him, Lady Fatima Zahra (a.s.) turned towards them and said:
"O people, who rush towards uttering falsehood and are indifferent to disgraceful and losing actions!
Do you not earnestly seek to reflect upon the Quran, or are your hearts isolated with locks? But on your hearts is the stain of the evil, which you committed; it has seized your hearing and your sight, evil is that which you justified cursed is that which you reckoned, and wicked is what you have taken for an exchange! You shall, by Allah, find bearing it (to be a great) burden, and its consequence disastrous. (That is) on the day when the cover is removed and appears to you what is behind it of wrath. When you will be confronted by Allah with that which you could never have expected, there will perish, there and then, those who stood on falsehoods."
Although parts of Abu-Bakr's speeches cannot be verified with authentic evidence, and despite the fact that we have already mentioned part of the actual speech, which Abu-Bakr delivered after Lady Fatima's arguments, certain it appears that Abu-Bakr was finally persuaded to submit Fadak to her.
Nevertheless, when Fatima (a.s.) was leaving Abu-Bakr's house, Umar suddenly appeared and exclaimed:
"What is it that you hold in your hand?"
Abu-Bakr replied: 'A decree I have written for Fatima in which I assigned Fadak and her father's inheritance to her."
Umar then said: "With what will you spend on the Muslims if the Arabs decide to fight you?!"
Umar then seized the decree and tore it up!!!
Which implies that the tradition of Abu-Bakr that says “we the entire Prophet ……………” is a fabricated on if not why did he decide to go against the sayings of the holy Prophet if he is sure it is from the Prophet?
The statement of Umar also denotes that there is conspiracy against the holy household of the Prophet (s.a.w.a.) if not why did he tore the decree signed by the first Caliph?
If the first caliph knows the consequence of the act of Umar, what is his reaction after the tore of the decree signed by him?
With all indication the second caliph masterminded the usurpation of Fadak even though Abu-Bakr was the head of the throne.