According to the TÜV the Cybertruck won't be legal to drive in Europe
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Musk isn't the only one working at Tesla. People are generally more successful at something if they do it because they care not just because it's their job. So whoever was responsible for the safety of Tesla's previous cars probably cared a lot about safety. I imagine they're the kind of people some people might call boring but no one would ever doubt their sanity. If they ever found a company, it's going to be called "SeatbeltX".
https://en.m.wikipedia.org/wiki/Nils_Bohlin
And the first seat belts were made by a person who had fun gliding in the air.
https://en.m.wikipedia.org/wiki/Seat_belt
None of your argument holds water. People who do dangerous things like being safe doing them.
But Tesla is a pretty shity workplace (people work until they drop, 2% fired every year to keep everyone on their toes). It wouldn't surprise me if certain hard to measure issues are swept under the rug by overworked employees.