Discussing tax law and morality in the same sentence doesn't even rise to the level of an oxymoron; it's just ludicrous.

I will take advantage of my over 65 tax benefit; I will take advantage of my mortgage interest tax benefit; I will take advantage of my homeowners' property tax benefit; I took advantage of the tax benefits of have two children as dependents.  

I will believe that your 'ethics and morality' exceeds mine if you tell me you will not do or have not done all of the above.

Until then, the 'ethics and morality' of tax law is a ludicrous subject and not worth discussing.