National Security Adviser Ajit Doval on Tuesday defended death penalty where larger interest of the nation is involved and deprecated those who questioned the execution of 1993 Mumbai serial blasts convict Yakub Memon. Doval referred to President George W Bush's address to the US Congress after the 9/11 attacks to defend exercise of such deterrence. Noting that there has always been a talk on just laws and unjust laws and about correct interventions and incorrect interventions, the NSA said,"The scriptures have addressed this dilemma and come to own conclusions.