Perhaps. But Nazism at its core is deeply racist and therefore anti-immigration and anti-minority. Do I even need to spell out what they did to Jews, Romas, the disabled and other nationalities?

Not trying to put words into your mouth, but I suspect that what you mean is that fascism is a spectrum, not Nazism itself. Fascism that started in Italy is the original fascism, and they are kinda mild compared to Nazism. While both Nazism and fascism reject liberal democracy and freedom of speech and press; embrace militarism; ultranationalism; and romantacising the past, some fascists embrace diversity. Even in Italian fascist propaganda, they advocate treating Africans as Italian compatriots. After all, Mussolini and his fascist party wants to recreate the multiethnic Roman empire. Why be racists then if that is their goal? Italian fascists don't mind other races so long as people subscribe to Italian national identity. Italy also either refused or delayed sending Jews to concentration camps, because Italian fascists don't really care about the Nazi view on Jews save for a few.

Even though Nazism are fascists, not all fascists are Nazis. Nazism took inspiration from fascism, albeit with more racism. Many would argue that Nazism is a subset of fascism while some say they are different ideology altogether. There was also a contemporary far right Brazilian group who admired Hitler. They sent a letter to Hitler praising him, but advocated for him to embrace diversiry like what Brazil does.

I'm so strongly opposed to illegal immigration that I think we should just open the borders and let folks come and go as they please.