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> But we want safety only when it's convenient.

Regardless, safety is still wanted. Just because people don't go over the top doesn't mean they don't want any at all. Having a lighter vs heavier frame would make a significant difference in a collision between regular-style cars and new, lighter ones.

The rest of your comment is attacking a strawman.

Its a non issue, I would buy and use a lighter car right now if it let say significantly cheaper.

A lot of the safety-related weight is non-negotiable, at least in the US. Every new car sold has a lot of airbags, and while they aren't mandatory, it's impossible to earn a good safety rating (from the NHTSA, a government agency) without them. So you could say the added "safety weight" (and drag, since the airbags make the car bigger on the outside to preserve cabin space) has been partially regulated into existence.

At some point in the future, I hope the NHTSA takes in "probability of crash" into their safety ratings for self-driving vehicles. Otherwise the safety bloat in modern cars will stick around. The equivalent of wearing a motorcycle full-face helmet while riding a bicycle.

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