Why do Shia care about Hussain and not Hasan?

The significance of Imam Hussain for Shia Muslims primarily stems from his martyrdom at the Battle of Karbala, which represents a profound symbol of resistance against tyranny and injustice. Shia belief holds that Hussain's sacrifice was a stand against the corrupt rule of Yazid, which is seen as a deviation from true Islamic principles. In contrast, Imam Hasan, although also a significant figure, is often viewed in a different light due to his choice to negotiate peace with Muawiya, the Umayyad leader.

Shia scholars emphasize that Hussain's actions at Karbala embody the struggle for justice, as reflected in the verse: And slay not the life which Allah hath forbidden save with right. Whoso is slain wrongfully, We have given power unto his heir, but let him not commit excess in slaying. 17:33. This verse underscores the importance of defending justice and the sanctity of life, principles that Hussain lived and died for.

Additionally, the legacy of Hussain is deeply intertwined with the Shia concept of martyrdom and the pursuit of social justice. As noted in a Shia tafsir, the narrative of Hussain's martyrdom emphasizes that he preferred death over dishonor and betrayal of Islamic values, which resonates with the Shia community’s identity and spiritual beliefs (Majma al-Bayan fi Tafsir al-Qur'an). In contrast, Imam Hasan's reconciliation may not evoke the same emotional intensity in Shia memory since it underscores diplomacy rather than martyrdom.

Furthermore, Hussain's sacrifice is commemorated annually during the month of Muharram, especially on the day of Ashura, where his martyrdom is mourned and celebrated as a pivotal event in Islamic history, fostering a sense of unity and identity among Shia Muslims. This commemoration reflects a broader understanding of standing against oppression, aligning with the Qur'anic call for justice and righteousness in the face of tyranny.