There is quite simply no way short of theft that one can amass wealth without saving first, so the tautological reality that says the rich tend to save explains to the mildly sentient in our midst how to grow wealthy in the first place.
Furthermore, it's tautological to say that big businesses in the U.S. employ a great deal of workers for being large, which means it would be foolhardy to require them to subsidize lower tax rates for firms in possession of prospects that are far less certain.