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.

smile
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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