You have not understood the difference between permitted and obligatory.
For instance you can eat halal food but if you behave like a glutton, that is wrong doing.
Being married to the prophet's daughter and then trying to bring another woman is shameful beyond words.
The prophet, pbuh, condemned Ali's move three times from the pulpit, so the whole community knew about it.
Shias are so hostile to women, they ignore even the mistreatment of Fatima, r.a.
Marrying 4 women is not obligatory in Islam. It is permitted in some situations under the rule of Equality.
Ali really hurt the beloved daughter of the Prophet, pbuh, when he had absolutely no need to marry another woman and that too of the worst enemy.
Do you know the difference between obligatory and permitted?
You have obviously not read the Quran.