Consequentism.
What goes around comes around yada yada
If you harbour terrorists who are wanted by your ostensible partners, don't be surprised if they lose patience and decide to take matters into their own hands.
Does that help?
even children are taught that 2 wrongs don't make a right
I'm not saying you were raised wrong though
imagine if such shouting made murder okay, like a secret, magical incantation any arbitrary thug could recite to immunize oneself from guilt - it's a ridiculous concept when you think about it!
Is an assination ever bilateral or judicial?
This is basically the trolley problem: Do you pull the lever and kill terrorist, or do you let him keep bombing movie theatres and organising hits?
they are always wrong
it doesn't matter if you also did a good thing, it doesn't even matter if the good thing was related: you aren't allowed to do the wrong thing, period, even if you really, really, really want to, even if you think you have a good reason to break the rules and do wrong
and as to your first question, eh, could be for some examples, but it'd be a distraction, as the answer doesn't matter, because the case we're discussing definitely wasn't either one