He's always been the le reddit anti-hero but holy fuck he legitimately becomes a nazi around season 4. Its not like he was forced into working with them like the cartels in the earlier season, he willingly chose to work for nazis, Walter White is by every definition, a nazi. It doesn't matter he killed them at the end, he did that because of a personal vendetta not because they were nazis. He's like one of the nazis who tried to assassinate Hitler, still a nazi. Walter White is a nazi :jesse-wtf:
Who else is in the meth business though? Cartels, goobers, and Nazi bikers are the only ones reputationally associated with it in the US. I don't see him being ideologically motivated so much as part of a market where the only other side is Nazis because Jesse represents the goobers. It's like a show about arms dealers. No matter how you situate the main character, most of their interactions will be with some kind of Nazi company.