Not to mention that the show established the craftsman guild as being long-established and exclusive industry in Numenor. No one can be a craftsman without joining the Guild. What Halbrand did was steal a badge with no credentials to back it up, meaning he wouldn't have been able to get a legitimate job that way anyways. A stolen badge does not equate to 'taking their jobs'.
And blaming the Elves on top of that just makes even less sense. The only reason it's brought up in the protest is so that Pharazon could have something to say about Elves in the show.