A member(Hujjat ul Islam wal Muslaimeen Akbari) of the revolutionary leader Office in Karbala said that historical knowledge is the best way to avoid the falsified path and to follow the right path.
It is important not only for knowledge but to take a lesson. Allah (SWT) also commands in Holy Quran Surah Hasher, verse 2,(فَاعْتَبِرُوا یا أُولِی الْأَبْصارِ) oh therefore take heed with eyes.
Moreover, Hur bin Yazeed committed a grand sin in the movement of Ashora. He was a barrier for Imam Husain (A.S) towards Kofa and to go back to Makkah. This makes you (Imam Husain) to move towards Karbala.
It is noteworthy that Hurr was a brave man. His bravery compel him to understand the right path. He was selected to stop Imam Husain (AS) because of his bravery. His bravery was of course a reason for his penitent.