I only had time to skim this, but if the numbers for percentage were from the article you posted then it looks like you made a decimal place error and your numbers are exaggerated by a magnitude...
The article stated 0.12 percent fatalities for street racing, therefore to compare that to 320 total fatalities the math is:
320 x 0.0012 = 0.384 deaths likely due to street racing that year, by probability. Assuming the error carried over to your estimate of the number of lives saved by 172, then, would be 1/10th of one life per year, or one life per decade, at the cost of ~100,000 impounds, lost hours of work, increased insurance rates, etc... Just makes an even better case for showing that 172 is little more than politics as usual
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