If you tax them more, they will just pass the cost down to the consumer. Big buisness is never going to swallow expenses for the sake of it, they will just pass it on to the consumer.
http://www.thestreet.com/story/10420766/1/big-oil-tax-bill-voted-down-in-senate.html?puc=newshome
http://www.thestreet.com/story/10420766/1/big-oil-tax-bill-voted-down-in-senate.html?puc=newshome