Prometheus
Master
The argument you're using is "bad guy does X, if we do X we are just as bad."
Same argument whether X is shoot/kill, bomb, waterboard, or slice open with a sharp knife.
As for "got the wrong person." What if you miss when shooting in self defense and kill the wrong person?
And afterwards, would you go around telling folk you weren't a murderer even though you killed someone?
And what if you didn't waterboard/torture/whatever and the WMD goes off in downtown, oh, pick a city, in the height of rush hour?
Again, the reasons for doing something and the circumstances surrounding the choice to do it make a big difference as to whether one is "just as bad" or not.
I cannot even begin to try and come up where you can attempt to rationalize the moral self defense of person (or nation) and the immoral murder/rape/torture of someone else.
What sort of warped mind must you have to try and equate defending oneself from a assailant and the killing an innocent child?
Your notion of a "ticking bomb" is laughable at best. You've obviously seen one too many seasons of "24".
As to ACCIDENTALLY shooting a bystander when defending yourself, again it's laughable and pathetic to try and equate an accidental miss and an intentional act of torture or murder.
Seriously man, were the good guys. We have the morals. The "scruples" as you put it earlier. How is our way of life any different than theirs in your world?
I'm sorry but under your line of thinking we should be strapping bombs to our kids "cause thats what they are doing!"