Ends Never Justify Means?

[Snoogins47]

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And part of the slippery slope not often achnowledged is that there can be much greater, albeit unintended, consequences from a small wrong act. You go to steal the car to save the 1000 and in your getaway unwittingliy strike a pedestrian in the street and kill him. That wasn't your intent, but it was a result of a chain of actions that began with your theft.

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Is there any part of this that isn't made completely worthless by the fact that unintended dire consequences could easily stem from a 'small right act' as well? It seems like such a childish rebuttal that I feel like I must be missing something from the original argument, but I don't really think I am.

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But Varlos went further, and so do you and others here, in trying to distinguish between the relative values of the lives of different persons so that you can justify taking their lives according to when in YOUR judgement they don't have as much value as your own life or that of others.

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Well, what makes self-defense killing acceptable? I mean, in MY judgement, my life has more value than that of the random person who would attack me with the intent to kill. That doesn't say much. I don't know if I can vouch for God agreeing with me. And what if, when I wrestle the gun away from my attacker, I fire at him, miss, and unintentionally shoot David before he can steal that car, causing 1000 people to die unless they steal candy bars?

And please don't say that I shouldn't have shot in the first place, because the attacker wasn't posing a threat anymore. Pretend he had another gun.