I don't mean to generalize, but working from some American fascists that I read/look at on social media. The thought process seems to be:

• Nazis are bad (but because of the Holocaust and nothing else they did or believed), maybe invading France was bad since they are a White Western nation, but it is the realities of war, so not that bad.
• The difference between Fascists and Communists is only that Communists go further and get greater blind fervor of their followers because they incorrectly claim the moral high ground (something Fascists don't do, they will just outrightly say "we want to kill Jews because we are irredeemably evil") claiming things like "there is no such thing as racism against Whites" (as Communists supposedly does racism and genocide against Whites), or SJWs claiming they are lifting up minorities as they do cancelling and cultural revolution or "Kulaks had it coming"
• Therefore, "we" are the good guys and any similarities of us to the 1930's fascists is fine as long as we don't exactly recreate the Holocaust.