One word - corruption.
The amusing thing here, is that you could have called your organization ‘Cat Lovers of America’, whose only theme was Tea-Party activities, and they would have passed you on with no issues. A month later, you change your name to ‘Tea Party America’, and any movement by IRS would have been strictly illegal at that point.
I will say this....several individuals need to be let go by IRS. If they don’t take movement, then Congress needs to set up a committee and unseat each employee.