Actually, it could matter, at least somewhat. A publicly traded company has a fiduciary responsibility to its shareholders first and foremost. I know plenty of people in small business, for example, who feel they make enough money that they don't have to cut corners on ethics or abuse their customers and employees. Go public and if you can screw them to get a few more cents per share to please Wall Street, you pretty much have to do it.
Abuse? No ethics? Have to screw 'them' to increase eps?
There are some companies who may follow this path, but not the majority.
Just about all businesses are in business to make money. But private companies can decide they have made "enough" profit. Public companies can't.
Such companies that you seem to despise are not all about maximizing short term profits. Those that do are sooner or later out of business altogether. If employees and customers feel abused they will leave. So the smart company, public or private, reduces its bottom line by paying higher salaries, providing benefits and making for a decent to good to excellent work environment.