The specific question that prompted this was, why don't we protect Nazism the way we protect religion, and to that I'd say that I have heard of exceedingly few

The specific question that prompted this was, why don't we protect Nazism the way we protect religion, and to that I'd say that I have heard of exceedingly few Nazis who have inherited it from their parents and feel the need to keep up external trappings of Nazism for the sake of family or social status. (The only example I can really think of is the Gaede twins, who renounced their mother's ideology by the time they were adults, and if you refined the question to not discriminating against minor children professing Nazi beliefs at their mother's direction, I am totally fine with figuring out a way to write a non-discrimination law about that.)