The difference between being coerced and coercing

[jogger08152]

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At risk of a brief threadjacking, at what point would it be okay for me to intervene?

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at the point were the interaction becomes non voluntary.

IE as soon as he charges the child w/ a knife you can / should shoot his ass.

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Perhaps even sooner. I don't let anyone I don't know wield knives on my property, whether they are charging or not.

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Who said this encounter takes place on your property? Perhaps it takes place in a shopping mall, or on the golf course. In any case, do you really agree with the above? In other words, as soon as "Villain" (who isn't a villain yet) charges toward you holding a knife, you can shoot him merely because you *think* he may be hostile? I hadn't figured you for a supporter of Bush's pre-emptive strike doctrine.

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If it were like Bush's doctrine, pvn would need to walk into some guy's house and shoot him in his bed because he thinks that guy has a knife.

The guy charging your kid with a knife is the one who initiated aggression. You shooting him is a response to that aggression and is therefore self-defense.

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At what point is his motivation clear enough that it's okay to preemptively attack him?

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He's attacking you in the scenario in the OP so there is no preemption.

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At what point is his motivation clear enough that it's okay to preemptively attack him?

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It's not ok to attack someone before they demonstrate aggression towards you. Once they've done so, you can't preemptively attack since you are already under attack.

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What constitutes a demonstration of aggression?