OP - can you think of something else you are vehemently for/against and replace the political sentiments with it? Like say you don't think people should be divorced, because it's giving up or breaking vows or whatever, but you find out your therapist is on his third wife? Would you feel the same way?

Because it's coming across (to me anyway) as maybe less about politics itself and more about "I found out something unexpected about this person I thought I knew and with whom I have worked for a while"? It just happens that what you found out was political, and you are having to reevaluate your views of your therapist as a person.

I say this because you seem so ambivalent - you say he has been very helpful, you don't seem to feel threatened or unsafe, but you can't seem to square this new information with who you thought he was and, actually, who you thought you were.