"Why UPA-I and UPA-II did not hang the killers of Rajiv Gandhi in ten years of its rule?" the counsel for Tamil Nadu asked a five-judge Constitution bench headed by Chief Justice H L Dattu.
The bench, also comprising Justices F M I Kalifulla, Pinaki Chandra Ghosh, Abhay Manohar Sapre and U U Lalit, is going into the maintainability of the Centre's petition opposing Tamil Nadu government's decision to set free the convicts after remitting their life sentences in the Rajiv Gandhi assassination case.
"Politics is not the dirty world. All political parties said don't hang them. People, all MLAs, opposition were against the hanging," he said.
"How could it be ignored that none from the opposition raised objection," he said, adding that the Central government, which did not take a decision on their mercy pleas during 2000-2012, cannot accuse the state dispensation of arbitrariness.
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"You listen, consider the mercy pleas, and do not hang them. Then you are merciful. When we do this, then it becomes arbitrary and whimsical," Dwivedi said.
The review pleas, challenging the commutation of death penalty to life term of Santhan, Murugan and Perarivalan, were dismissed by the court in February last year on the ground of 11-year delay in deciding their mercy petitions.
The three convicts are lodged in a Vellore prison. Former Prime Minister Rajiv Gandhi was assassinated on May 21, 1991 at Sriperumbudur in Tamil Nadu.
During the day-long hearing, Dwivedi said the state is empowered to consider changes in "factual and material circumstances" of the case and the convicts.