As regarding specifying a particular ziyarat for the Master of Martyrs...
As regarding specifying a particular ziyarat for the Master of Martyrs, in addition to urging others to visit his shrine at any time, rather than that of any other Imam, or even that of the Master of Messengers (S), there are many reasons behind that. The most important reason is that the Umayyad mentality is still alive, and it increases or decreases in intensity from time to time. Those who have certain vested interests periodically howl about it.
Although the Umayyads have turned into dust rags and nothing is attached to their name except shame and they are cursed whenever they are mentioned, yet since such a propensity is atheistic in nature and is promoted by their gang and by those who join them from the generations.
(‘a) paid a special attention to putting its fire out and to attracting the attention to its deviation from the right path, the path brought by the Greatest Saviour who suffered so much in order to disseminate his call and keep it alive.
One of the means that lead the souls to such a path, acquainting them with the injustice meted to (‘a) and directing them towards the divine right clarified for them by the great legislator (S), is the cause of the Master of Martyrs: It is full of tragedies to which the heart of the most bitter enemy softens, let alone that of his follower who recognizes the Imam's usurped authority.
The Imams (‘a) desired that their Shi’as should remain all year round, as days come and go, fully alert with regard to those who usurped such an authority, the ones that are so distant from the right path. They, therefore, required them to be present around the shrine of the masters of the youths of Paradise on specific occasions, and during other times as well.
It is only natural that such assemblies bring to memory the cruelty employed by the Umayyads who slaughtered the children and banished the daughters of the Prophet (S) from one country to another. They were forced to ride Hands to the necks tied On bare hump she-camels they did ride.
No veil did their faces find: Behind forearms and hands did they hide.[^1] Fervour and manliness insist that nobody should surrender and accept to be ruled by anyone who inflicts such horrible deeds on anyone else at all, let alone on the family of the most holy Prophet (S). It is then that the souls become filled with emotion, feelings reach their ebb, and judgment is issued against those filthy folks who reneged from the Islamic faith.