The letter was written in response to this request for comments: http://www.whitehouse.gov/blog/2012/06/25/help-us-shape-our-...
If you (like briandear) believe that including anti-tax arguments in a response would increase the efficacy of the response, I'd strongly suggest that you avoid a career in marketing or sales. Not trying to be snarky, but I can't think of a polite way of expressing how ineffective the inclusion of general anti-tax sentiment would be when attempting to persuade the target audience.