I wouldn’t know what’s “wrong” or “right” in these kind of matters.

You should do whatever is better for your mental health.

Are you better without having contact with your father or having contact with him?

It’s the only question here.

You should be aware that you would not change his mind with this or make him question his beliefs. If something his beliefs would probably grow stronger after something like that.

You also should be aware that that action would have zero impact on the far right campaign.

So if you do this is for your own mental benefit, nothing else. Don’t let any kind of pressure on any direction force you to do anything that’s not the best for your mental health.

To be true, for what I read, if I was in your situation I wouldn’t cut ties. You said that he supports you, and for me that’s the important thing in a father. I personally have no issues having personal relationships with people with vastly different political ideologies. My mental health does not suffer from that. But every person is different, so you do what’s best for you.