"... they will have to pay taxes on donations ..."
Under the FairTax donations of this sort are not taxable - nor should they be.
So the liberals who give money to these hate groups should be tax free. I would rather our churches pay taxes so the hate groups have to also. I know what you mean about the fair tax exempt status, but most of these organizations have a lot of money. Remember we could then turn around and give even more money to our charity of choice because of the tax savings from the government.