I listed the major ideological features of fascism at #2,162 and don't recall anyone making any counterargument regarding its applicability to the movement of which Kirk was a leading light. That said, I'm not at all confident that you understand what sets Nazis apart from fascists. Hannah Arendt
wrote that nowhere did the differences between German Nazism and Italian Fascism "come more conspicuously into the open than in the treatment of the Jewish question." She goes on to explain how the OG fascists preserved a strong supermajority of Italian Jewry throughout the war despite Nazi disapproval and occupation; it only takes up a couple of pages if you are interested. Calling someone fascist isn't the same as saying they are the kind of person who would happily build and operate a system of death camps, and that difference really should matter when talking about the ethics of violent resistance to a political movement.