Injustice is a quality relating to unfairness or undeserved outcomes. The term may be applied in reference to a particular event or situation, or to a larger status quo. In Western philosophy and jurisprudence, injustice is very commonly—but not always—defined as either the absence or the opposite of justice.The sense of injustice is a universal human feature, though the exact circumstances considered unjust can vary from culture to culture.
Imam Al-Mahdi (AS) will remove injustice and tyranny from the whole world. His time of re appearance will be filled with injustice and tyranny. That does not means by any mean that we have to add on injustice and wrong to hasten his re appearance, but on the contrary, we remain as sincere followers of Ahlul Bayt (AS) responsible to do and spread good deeds which is the aim of our Infallible Imams and all the prophets (AS).
The bad deeds are from bad people as Allah (SWT) says in Quran: Evil deeds has appeared on land and sea because of what people have committed. Al-Room: Verse 41.
We should always prevent and counter evil deeds by doing and spreading good deeds but our efforts will never be enough, and the injustice and tyranny will go on till the re appearance of The Divine Leader from Allah who will remove away the evil and establish the pan state of Good and Justice.
There is no dichotomy at all.
Thank you for your question. The Imam (af) cannot act to his full effectiveness without the support of the Ummah itself and so it is the Ummah that has chosen this situation for itself. In the same way, the Imams could not prevent the cruelty of the Ummayid and Abbasid dynasties or the injustice of some of the prior leaders as these are the leaders that the Ummah had chosen for themselves in rejecting the leadership of the Imams (as). The injustice in this time is a natural consequence of the physical absence of the Imam (af).
May you always be successful.
As Allah is always supporting the Truth against evil, Imam Al-Mahdi ( AS) being the best Servant of Allah in this time, is always acting against injustice and defending the Ummah against cruelty in ways best known to Allah ( SWT).
When we don’t know how Allah (SWT) is supporting the Truth against the evil in our time, we should not claim that Allah is not defending the Ummah against cruelty.
Same exactly is the situation with The Most Humble Servant of Allah, Imam Al-Mahdi, who is the Divine Leader appointed by Allah ( SWT).