The speed limit should be reduced to 5 mph

Since PI is true and C false, and the argument is valid, P2 must be false. So the original argument, since its P2 is the same, is unsound. Of course, this does not mean that nothing should be done to reduce road fatalities. It means only that the fact that a given remedy would reduce them is not sufficient for carrying it out. As explained in the Chapter 5 section on practical arguments, we must, in such cases, show that the envisaged remedy would not cause worse problems, and also that no other remedy would be more practical and effective.

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