Ideally, I would strike to incapacitate. But I assume you are speaking of an unideal situation, where the only choices are to "kill" or "allow others to die."
In that situation, I would strike to kill. I place greater value on the safety and well-being of others over the grief I might cause to any surviving friends and family of the victim--or to myself, for taking the life of another.
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In that situation, I would strike to kill. I place greater value on the safety and well-being of others over the grief I might cause to any surviving friends and family of the victim--or to myself, for taking the life of another.