Taxation, under U.S. laws, is definitely not 'equal'. We like to see ourselves as a 'progressive' nation, helping out those that are less well off through our tax system. But if we step back and take a good look at this, is it really true?
Consider our civil justice system. From the same measure we apply to taxation is 'law' regressive or progressive?
Take another step back. Ask yourself this, considering everything under the control of law, taxes, civil courts, criminal courts, human resources, politicians, etc do we actually live in a progressive society or a massively regressive one?
Now, add the fourth dimension to your perspective, time.
Have we, since the 1960's, become a more just society? Or, perhaps have we become, in terms of our 'law', a third world country?