What's acceptable (i.e. It's ok if 1 person dies on this project) is different than what's the potential risk (i.e. There is a risk that 1 person might die on this project).
If you're working on a project and 5 people have died so far and you've still got a lot more to do I think it's pretty reasonable to expect that more people will die. So, if you're going to continue the project you're considering it acceptable that somebody else will die as well.
Sure, you shut it down for awhile and then just let it start back up again and after the next death shut it back down and rinse-repeat. If it was the 1930s you wouldn't have to bother taking the break in between deaths but the rinse-repeat means we have a non-zero tolerance for death.
if 5 people have died the same way so far, modern workers would not find it acceptable that more of their friends will die from the same unaddressed cause before the building is done, and thus would not, in fact, continue the project until something is done about it.
What's acceptable (i.e. It's ok if 1 person dies on this project) is different than what's the potential risk (i.e. There is a risk that 1 person might die on this project).