No, sulfur release is not a core part of steel production, and indeed sulphur emmision has been drastically reduced since regulations made steel producers bear

No, sulfur release is not a core part of steel production, and indeed sulphur emmision has been drastically reduced since regulations made steel producers bear the cost of sulphur emmissions, removing it as an externality. Labs don't continuously spew out diseases, but they very much must impose the risk of such releases upon others. That is the cost. It costs money to insure against risk, even if the disaster never comes to pass. If a biotech company reduces its costs by implementing looser safety policies thus increasing risk to the surrounding population, that cost is borne externally. Hence the name.