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Well it's a little more complicated: you should always spend money where the most deaths prevented per dollar are achievable. So if you can save 1 life per $20 spent on thing A, and 1 life per $100 spent on thing B, you shouldn't spend any money on thing B. That's because each life saved via thing B means five people died from not having thing A (net loss of 4 lives).

while that is good in theory, the reality is that the $100 spent on thing B is much more visible. The action from money spent saving thing A could be less visible, lower profile and generally more pedestrian, so politicians who makes these decisions go for the more flashy option and therefore garner more votes or credit.

The goal has never been to save more lives - which is the root cause of the TSA's problem.

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