I'd say it's more mass personality disorder than any real ideological content. That is, the content (paid lip service to, it's ALWAYS lip service) can wildly vary and turn around on a dime, if need be, without the underlying nature of it changing.

Consider how many streams the alt-right consists of! How it reaches into all sorts of subcultures. I bet you there's an alt-right section, of, say, alien believers. Just like there's fellow travellers in all major and minor religions. And they can fuse quicker than the left can stop to bicker.

The perpetrator of the greatest attempt to date ultimately died because the greater world powers did not respect fascism as rulership.