There might be some who use the Zoner ID as a free pass to powertrade.
Not all Zoners who aren't hell-bent on starting a war with some toasters do, however. My trader is actually ID'd as a trader, and does not expect to be given any sort of immunity. My Zoner, a separate set of characters on a separate ship, is ID'd as a Zoner, and is a Zoner NOT in order to avoid conflict, but rather to avoid being forced into a conflict or other situation in which it wants no part.
To start any sort of Zoner government would cause damage to a lot of Zoner RP storylines; after all, Zoners became so largely to avoid living under a government and having to submit to politics guided by other (fallible) people.
If a any Zoner tries to exert his power over other Zoners by trying to institute some sort of government, you can expect the Robinsons to fight it tooth and nail; it is precisely that sort of thing that caused them to become Zoners in the first place. As for them, they will not participate in any action against any Harvesters unless the Harvesters open fire on non-hostile targets in the RFS Freedom's ZOI.
If some other Zoners want to fight Harvesters on their own, good luck to them, but there's no need to drag all of us with you.
