I think, at least for those in their ranks who are not (yet) convinced Nazis anyway, it’s a similar principle to the mafia: the newly recruited opportunists have to publicly spout Nazi slogans to prove themselves - just as a soldier in the Cosa Nostral has to have committed a serious crime, many particularly serious ones, if he ever want to become a “capo”.

Like other criminal organizations, MAGA tries to protect itself from potential informants, I think. If you only recruit people who are unscrupulous enough to openly admit to this Nazi bullshit, there’s less chance of someone having a conscience and making all their shady dealings public.