The value of a human life is not infinite, but that doesn't mean it isn't worth more than a certain amount of time spent on a construction project. The people who make executive choices about construction projects should not decide that it is acceptable for x people to die on this project in exchange for y fewer months construction time. Accidents happen, but we should not plan to trade lives.

Consider if by sacrificing someone on an altar you could magically cause several months of construction work to happen overnight. That would still be murder.