Well, now you're making a very different argument than the original "companies should not profit from products that might kill people." But I'll bite anyway. There are plenty of products that, though used correctly, can under some circumstances cause injury or death.
A very obvious one is medication. There are many medications that can have serious side effects, including death, when taken exactly as prescribed. We continue to use them because the benefits outweigh the risks.
You mentioned chainsaws. It is true that the majority of chainsaw accidents happen because of operator error. However, that doesn't mean that all of them do. The only way to completely eliminate the possibility of harm is to not use a chainsaw. But again, we continue to use them because the benefits are big enough.
There does need to be a standard for how safe autonomous vehicles need to be before we allow them on the roads. But setting that standard at "they need to never cause a death" is not only unrealistic, it is totally inconsistent with how our society deals with other potentially dangerous products.