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I would say that the reason we don’t do so is because such regulations would be extravagantly expensive, politically toxic and, at the end of the day, unenforceable. Besides, your comparison seems ill chosen since despite all that government regulation of vehicles and driving, there are about 35,000 traffic fatalities each year in the US, compared with around 13,000 firearms fatalities. This in a country where there are around 265 million privately owned motor vehicles and around 300 million privately owned firearms.