I still don't understand a lot about shi'sm but I can understand that if Allah wishes for something to happen it will happen and the past happened
We are not to get upset and beat ourselves over it and be displeased with the outcome and point fingers and blame. Just not good to do
Most people don't know the tears of Yaqoub (a) for Yusuf (a) was not that Yaqoub (a) feared for Yusuf (a), he feared for people going to hell for their hate of Yusuf (a) and that guidance would not ensue if people reject him.
God made him higher in knowledge and exalted in him in his state of sorrow.
He understood if Yusuf (a) is oppressed, then Satanic forces will win. This was the secret of his tears, and it reformed the brothers of Yusuf (a) to come back to Yusuf (a) eventually.
Yaqoub (A) understood their hate towards Yusuf (a) was hate towards God and then all good was in coming back to Yusuf (a) for his sons.
We are hoping the tears for Hussain (A) bring the world back to the Mahdi (a) and that guidance is achieved through them.
Hussain (a) is exalted, has abundant blessings, has Allah (swt), he don't need our tears for just him. But understand Hussain's (a) heart and him trying to steer mankind to the straight path, and you will understand the sorrow of Yaqoub (a) for Yusuf (a) and our tears as well.