There's specific exemptions in the tax code for charitable and similar organisations, and a clear public policy objective behind that.
Do you oppose that exemption, or perhaps you do not see a distinction between the receipt of money by charities versus the receipt of money by individuals?
I personally think CAT is a great tax. From the State's perspective it is something of a sitting duck to an extent. It is also an entirely progressive tax, since it is a form of wealth tax. If ever there should be a tax that the great unwashed could get behind it should be this - the vast majority of people will never find themselves liable to it, so to the extent that it's a tax on other people, and "the rich" (a group that most people like to define as not including themselves), it should be a slam dunk.
I don't buy the whole, "but it's already been taxed" line at all. Sure all money in the economy has "already been taxed", isnt the whole point of money that it circulates, getting sliced, diced, and taxed, along the way.
The bottom line is, if the State wants to broaden, or maintain the width of, the tax base, then it absolutely shouldn't water down CAT. Particularly since the inevitable result of paying all the wealthy Pauls, will be the further robbing of the put upon Peters in the middle.