Do you think they are more industrial accidents now than 50, 100 years ago?
In absolute terms, there can be no question that the impact of industrial accidents is greater now than it was 50 or 100 years ago. But even setting that aside, all relative improvements that have been achieved since then are thanks to those who fought to achieve them, not some vague specter of human progress and good will that guides humanity to a brighter future.
The other thing is that to even compare the situation to 50 and 100 years ago is misguided thinking. 100 years and 50 years ago were each different from each other and both different from now in ways that go beyond how much workplace safety the western nations have developed. The main thing is that the economy doesn't work like it did 50 years ago, in America, the west, or in the rest of the world. America has much fewer workers exposed to the harmful industrial situations that originally generated workplace safety as a major concern to begin with. An even to the extent it remains a concern, most of the responsibility for training and safety ends up falling on the unions. As a former employee of an Industrial Chemical Workers' Union I observed their main responsibility was processing its own paperwork and using government funds to conduct hazardous worker training. Meanwhile, the private owners of many large industrial chemical concerns and the trains that carry those industrial chemicals have been praying at the altar of Larry the Liquidator and making money hand over fist while gutting key safety roles. You can roll your eyes at the Norfolk disaster and wave your hand at certain attributes improved safety from a statistical perspective, but those statistics are both 1. massaged by the very entities that release them for best optics, and 2. in no sense all-encompassing.
To briefly digress on this point, consider the lithium-ion battery. You may be aware that the lithium-ion battery possesses a capability to cause fires that are generally immune to asphyxiation because thermal runaway causes these batteries to spend all their own energy generating heat until they are fully discharged. You might not be aware that the current state of federal firefighting regulation cannot recommend a standard for handling, and actually does not possess a classification for lithium-ion battery fires at all. It's not an electrical fire, for starters. Safety-minded industry-working folks like myself regard this as a major blank spot. And it tends to be the case that it takes a really bad, high-profile accident to work the public up enough for politicians to do something about it. In the meantime, Tesla car fires are going to continue occurring and taking hours to put out.
You might say, "the government regulation doesn't change the reality of how easy the fires are to put out." But I would disagree. Having a standard and paying official attention to the matter are the core of enforcing safety standards within an industry. It might also illuminate additional proper countermeasures. You might also say, "but this one missing standard can't make up for dozens of safety standards that have been implemented since then." It certainly doesn't, but again we have to ask who is really responsible for generating and enforcing standards. For the most part, they do tend to be the industrial workers and engineers themselves. The government is the bludgeon that forces the owners to play by safe rules.
At any rate, talking about how automation exposes fewer workers to hazardous conditions now, this is also a narrow view: the great expansions of the last fifty years means much new unsafe work is now done in Malaysia, Vietnam, China, and India. The quality of plantation labor has also scarcely improved in many nations. Certainly, major western companies and brands still lean on slave labor, and still use their resources and the authority of the IMF and World Bank, etc, to ensure conditions around the world remain ideal for retaining such slave labor.
Now, supposedly, this has nothing to do with America and the west, because all governments are responsible for their own policies. But government policy actually has the least to do with it per se. What matters is the development of industrial power, the economic forces that are irresistible and work to transform places like Malaysia, Vietnam, China, and India into large workshops or plantations, and that the owners of these workshops and plantations are many of the very same owners who have bought and sold the governments of the west. No, not all of them are Chinese. There is actually a constant battle between the people of these countries and the private owners of all the forces of production around the world about these exact issues. And the battle for workplace safety and even basic dignity continues forevermore and will continue to continue even after you've passed hundreds of new safety laws, because one liquidator later and you're crashing toxic trains into Ohio again.