On truckers dying on the job: you'd probably agree that there's arrangements that could save more truckers' lives but are not applied because of cost and lack of social pressure. For instance driver fatigue is said to be the primary cause of death among trucker, and that's obviously an issue we could throw money at to at least alleviate (but it wouldn't always be cheaper, that's the point)
And to your point, yes, that same logic would aplly to a ton of high risk occupations. There's building construction techniques that cost more but have less risk, but we won't apply them where there's no pressure to do so.
Are we letting them die then ? I don't see the hyperbole in saying yes, as a society we're not willing to put the money to reduce these deaths. I see it as a part of life, and don't think we'll change much even as autonomous vehicle come (if they kill 1 in 10000 people but cost way less than now, we'll swallow the pill collectively)