the entire point of the alt-right is to fool people that it's not just the same old nazism and racism coming back
their entire strategy builds on deceptive tactics of
arguing in bad faith, internet meme humour, ad hominems, and whitewashing of horrible ideologies
the difference between the alt-right and traditional racists and nazis is that the alt-right are much smarter and more deceptive in how they sell their message
one important gambit of theirs is to draw people in with fake moderates, "centrists" and "classical liberals", slowly moving the overton window ever right, exposing people to progressively worse people
sure, someone like colin moriarty or scott adams is not as bad as milo yiannopoulos, who is in turn slightly less bad than richard spencer. but they are all part of the all-encompassing alt-right ecosystem, and they all serve as an important part of the gradual red-pilling chain that step-by-step pulls people from, e.g., boogie2988 to scott adams to jordan peterson, to milo yiannopoulos to richard spencer
trying to make distinction of saying, "this guy is not as bad as that other guy and so we should not use the same label for both" is doing exactly what they want. by making a distinction between scott adams and richard spencer, we give the fake moderates the deniability and benefit of the doubt they need to pull in more people so they can be progressively red-pilled and pulled further right in the alt-right chain. distinguishing between the alt-light and the alt-right is therefore a fool's errand. they are all part of the same ecosystem and they are in symbiosis with each other, and therefore they are all alt-right
the mistake people make is that they say that "alt-right" is the same as "far right racist" or "nazi". but that is not quite true. the alt-right is a coalition of "moderates", libertarians, conservatives and far right racists that work together to push the debate and the overton window right-wards.
in short: the "alt-right" is really more about a collection of deceptive internet debating tactics, than it is about any specific ideology.