It's easy to explain to people in the real world how treating life as having infinite value is actually impossible, and nobody actually does it.

Also, the "acceptable" part is the statistical average. It's still a tragedy that any particular person dies. I do have sympathy for you and your wife, but we have millions of deaths per year that deserve equal respect, and we only have so much we can do to prevent each one. We should try very hard, but we can't try infinitely hard.

There's always a tradeoff. We could make driving much safer by enforcing drastically lower legal speed limits, much longer mandatory training for the drivers and even higher safety standars in cars. But we have chosen not to, because that would be perceived as limiting freedom, being inconvenient and cost money. But more than thirty thousand people die in car accidents every year in the US alone.