Responding to the OP only: it has always been my personal belief that a person should stop a criminal permanently if given an opportunity. I came to this conclusion based on the twin facts that it conforms to my moral principles and is the most practical solution to crime.
Please elaborate, as this sounds similar to the idea that the "hero" is "Judge, Jury and Executioner".
The scenario is that you could escape without danger. The above quote seems to indicate that you would insert yourself into a situation so you COULD end the life of someone you deemed a criminal. This smacks of vigilantism.
Would you knowingly place yourself in danger so as to:
stop a criminal permanently if given an opportunity
VR
Matt