I recognise the sense in what you're saying, but I tend towards treating corporations much like I treat people with regard to reputation. The reason for that is that I want companies to have to think seriously about how it will hurt them long-term before they trade off that reputation.

I don't want it to be an optimal business strategy to be evil to maximise growth, and then become nice once evil no longer pays off. Holding a grudge longer than might seem strictly logical is my way of pushing in that direction :-).