There is indeed a substantial difference between full scale illegal criminal invasion of a sovereign nation, performing "shock and awe" terrorism on its civilians, occupying the nation, flatten its towns, massacre tens of thousands of its completely innocent civilians, torturing upto death a few, shooting unarmed wounded men, murder a wounded teenager and call it "mercy killing" (yes, we "mercy kill" our animals too) etc... etc... and a few civilians of that nation taking revenge for all this (and an amount of other "neglectable things") with as their target one single, possibly also innocent, person.
salaam.