I kind of get what you're saying, but what you might be missing is that we are long past the point where politics is just a disagreement on how to achieve the same general goal. The mainstream GOP is full on pro-bigotry, anti-freedom, and if not openly fascist, they sure do seem to do a lot of fascist-like things. This is not hyperbole.

Additionally, money is (and always has been) the lever to obtain power, so knowingly giving money (directly or indirectly) to a person who will use that money to promote or assist these kind of beliefs becomes a moral question, not a financial one. You may not want to believe it is so, but it is so.