To clarify, you've seen and are aware of this disregard for worker safety/well-being, yes? There are functional, often powerful businesses where the workers' lives are treated as disposable. Even when the capitalists running it could easily afford to be more humane - see lucrative American and European firms being fine with building and hiring factories that produce a steady stream of coffins and cripples. Without being forced to do so, many can't be arsed to even make fire exits. We can't assume that whatever a business is paying is a livable wage, or that they will prioritize worker well-being.

Now all that aside, just because bad choices happen or accidents or whatever in the 'real world' doesnt mean that anyone owes you anything.

That is not an immutable law of nature, that's a chosen personal perspective. Others think that people are entitled to a basic level of decency by virtue of being human. Societies operate and exist via a sense of collective identity and shared obligations. People feel that they owe their elderly parents assistance in their old age, that children are owed the care of their parents, etc. Religions dictate what universal standards of charity and respect others the believer interacts with are owed. A citizen owes the government taxes, and in return the government owes the citizen protection. And so on.

Plus, whether something is "owed" or not tells us nothing about whether providing it would be a good idea. Captains might not be "owed" warning that there are shipbreaking rocks nearby, but building lighthouses to make sea travel safer is beneficial.

"Walmart can afford to open literally hundreds of new stores each year", uhh maybe? I havent looked into their latest financial reports but if they would have seen the opportunity they would have.Lets get something out of the way. You know that businesses don't have wants/needs. People do. If the managers/investors of Walmart have a tons of cash just collecting dust they would either try to use it (more stores) or ask for whats called 'dividends'- cash back to share holders. Guess who the share holders are? Regular people who have pension funds, savings accounts, 401ks, Roth IRAs, etc. The 'market' is always pushing Walmart to operate efficiently and meet certain expectations or else they get penalized by lowering the share's values. So that incentivizes them to do a good job.

They expanded by 195 stores in the last year alone, and 2016 was a slow year compared to how many they normally add. They have billions of dollars in profits to spend, it's just a matter of where they choose to. The shitty conditions are a deliberate choice rather than an unavoidable outcome caused by lacking resources. The idea that maximizing shareholder profits takes priority over worker well-being is just one possible way of organizing an economy, and a deliberate choice.