One reason is that it annihilates the government's ability to incentivise or disincentivise behaviors through taxation. Take charitable donations, for example- their tax-exempt status helps drive money into the coffers of charities, and this is because the government wishes to incentivise charitable giving. With a Flat Tax, you can't do stuff like that anymore.
(Of course, I don't have a pony in this race in any sense, so I may be wildly off.)
(no subject)
Date: 2007-05-23 04:46 am (UTC)(Of course, I don't have a pony in this race in any sense, so I may be wildly off.)