Well that is the problem... People only do what interests them. It seems like their main interest is solely in making money. When people are so blinded by money and profits they tend to forget about relationships and the well being of others. Hence the reason our society has become so litigious. Now I will never claim to know the percentage of people who only care about money and profits but it seems to be high.
Everyone always acts in their own self interest, and it's this very same self interest that makes a market economy possible. Is it in your own self interest to become a Robinson Crusoe? Or is it in your best interest to cooperate with others who are better at doing, or producing something than you are? Leaving you to do something that they need or want someone else to do? Comparative Advantage at work.
The problems you are talking about occur when businesses, or entire industry sectors, have guaranteed market share, or a competitive advantage courtesy of the State. The welfare of your employees isn't as important as it is for a business in a highly competitive market with razor thin margins. Now, that is not to say that all managers in these types of businesses are ALL scumbags, but you tend to get the creme of the crap, rather than the creme of the crop. Profit margin becomes the end all be all.