Why is U.S. taxation so unfair?

Seems unreasonable that many corporations are spending more on lobbying than on taxes. And if reducing corporate taxes is good for job creation, why do the biggest beneficiaries of tax breaks--companies making billions of dollars of profits--keep laying off workers? Why are these corporations paying negative taxes? They are literally being paid by the government to make profits, while average people pick up the tax burden. All this while executive pay is now 343x that of the average worker and median household income fell $3,719 between 2000 and 2010, when measured in 2010 dollars.

http://www.ibtimes.com/articles/264481/20111209/30-major-u-s-corporations-paid-lobby.htm

(Thanks to Max for the link)