What is vigilantism and when, if at all, is it justified and why?

A time to kill, 1996 movie

Lucien tells Jake, “You can win this case, and justice will prevail. But lose, and justice will also prevail.” What is meant by this?
What is vigilantism and when, if at all, is it justified and why?
The film title, pulled from Ecclesiastes, is A Time to Kill. As you see it, is there really a time to kill?

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