Because when a business tries maximising it's profits the best way to get business is to act in the interest of it's target market? And as long as it's target markets interests are served and it doesn't adversely affect other people (and I'm being strict on 'adversely affecting', I'm speaking more about things like the enviroment. I don't consider a business making another redundant through innovation as adversely affecting) then I see no problem. When Sony designs a console they want the best console they can make given the price they will sell it at, you know, acting in the potential gamers' best interests. I'm certain the higher ups in Sony who aren't involved in the production of playstations don't give a fuck about how good the console is, just how much money it makes but it just so happens the best way to do that is by serving the people. Examples would be Fair trade coffee, paper companies that plant a certain amount of trees for every one they cut down, companies such as this
http://www.solarroadways.com/Home/Index capitalising on the fact that the public in general want to use renewable energy. I'd like if you could give some examples of businesses acting within the law that go against the people's interests.