1-3 Butadiene, an important industrial chemical and a common environmental air pollutant, has been shown to be a weak carcinogen in the rat, but a potent carcinogen in the B6C3F1 mouse. This species difference makes risk extrapolation to humans difficult, and the underlying mechanism must be clarified before meaningful risk extrapolation to humans can be made.
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A man's death makes everything certain about him. Of course, secrets may die with him. And of course, a hundred years later somebody looking through some papers may discover a fact which throws a totally different light on his life and of which all the people who attended his funeral were ignorant. Death changes the facts qualitatively but not quantitatively. One does not know more facts about a man because he is dead. But what one already knows hardens and becomes definite. We cannot hope for ambiguities to be clarified, we cannot hope for further change, we cannot hope for more. We are now the protagonists and we have to make up our minds.
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All truth, in the long run, is only common sense clarified.
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When you have shot and killed a man you have in some measure clarified your attitude toward him. You have given a definite answer to a definite problem. For better or worse you have acted decisively. In a way, the next move is up to him.
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