A bench of justices M B Lokur and U U Lalit said it was "abundantly clear" the right of self defence or private defence falls in one basket and the use of excessive force or retaliatory force falls in the another basket.
"A distinction must be drawn between the right of self defence or private defence and use of excessive force or retaliation. Very simply put, the right of self defence or private defence is a right that can be exercised to defend oneself but not to retaliate," the bench said.
The court drew a fine line to distinguish between self defence and excessive retaliatory measures.
"There is a qualitative difference between use of force in an operation and use of such deadly force that is akin to using a sledgehammer to kill a fly; one is an act of self defence while the other is an act of retaliation," the bench noted.
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The top court said to provide assurance to the people, the allegations of extra judicial killings must be thoroughly enquired into as "this is the requirement of a democracy and the requirement of preservation of the rule of law and the preservation of individual liberties."
It said that "unfortunately occasionally" use of excessive force or retaliation leads to death of the original aggressor.