That isnt how ideological fanaticism works though, particularly religious or reactionary. The fanatics remain no matter how big the hammer is. They are true believers who will continue their crusade no matter how adverse it may be. They will find the down trodden, they will find the disassociated and dissatisfied.
There are plenty of reasons why your average human would join any fanatic cult or following, even as a plain foot soldier, cook, or just supporter who wont rat them out. Especially during a time of crisis when traditional systems and institutions have let you down, like Bene is posturing.
It might be a relatively small nuisance that pops up once in a while, but a persistent one whose leadership does not flinch in the face of said comically sized hammer due exactly to their fanaticism and belief.