The point of audits is to exercise rights.
It is perfectly legal to film public officials in the course of their duties in public, these are tax funded employees who serve the public.
Any persons exercising legal activities do not need to account for their actions. You can film any person or structure from a publicly accessible area.
Ok, that's the legal stuff out the way, these 'auditors' are not doing anything illegal and do not need to provide ID or answer any questions pertaining to a legal activity.
So... right now these people are testing the boundaries of the system and seeing if their rights are being respected. Sometimes they are, sometimes they're not.
The point is say the government/authorities/police do something, enact a law, create restrictions that you feel goes against the public interest. If we lose the right to film them they can't be held accountable, that's the reason for these often boring videos.
Sure the person may need to 'get a life' and some are only doing it to provoke a reaction so they can those 'youtube viewz' but the underlying reasons are worth fighting for.
Here's a guy who does a better job of these things:
This one is interesting because everything's fine till the boss comes out:
Public officials need to remember who they are paid by and who they serve. The majority are great and providing a valuable service but there are more than a few 'bad eggs' who create the us & them tension.