The OP may not have used the most politically correct language but IMO it's a valid question for this board since it addresses the physical security and (literal) survival of our children.
The PC approach:
Is deadly force justifiable in order to prevent the abduction of a minor?
The PC answer:
It depends entirely on the jurisdiction in question.
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"There is not a man of us who does not at times need a helping hand to be stretched out to him, and then shame upon him who will not stretch out the helping hand to his brother." -Theodore Roosevelt