I just don't see how one could justify shooting someone as they run away.

Sure, them stealing something of your's is wrong. But how could property even remotely be equated with someone's life?

(Note - I'm ONLY talking about property)
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"Nature has constituted utility to man the standard and test of virtue. Men living in different countries, under different circumstances, different habits and regimens, may have different utilities; the same act, therefore, may be useful and consequently virtuous in one country which is injurious and vicious in another differently circumstanced" - Thomas Jefferson, moral relativist