10-12 mph is a pretty normal biking speed...plus it would shift at the margins regardless to have some protection, there is some number of people who wouldn't have been in a coma had they worn a helmet
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No I have no idea how to quantify that, but I would like to hear your answer and to clarify that you are anti hard hat?
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seriously this is the feeblest analogy i am not anti hard hat. we don't need to worry about disincentivizing construction workers out of construction; they are incentivized by their pay. we don't receive monotonically increasing benefit from more people being in construction.
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