The rationale for the restriction of military vessels is specifically a justification based on the unique structures of military organisation (that of a unified, rigid, organised chain of command) and towards the real life conventions of militaries and laws pertaining to them. Though I personally agree with you on the "RH battleships-Banshees" argument, though perhaps Rheinland sold off some of it's fighters to pay off war debts years ago.
Thus, the comparison of regulations instituted by military factions to ones that you allege would be imposed by nonmilitary factions or have a rationale to impose as the results of above policy is a slippery slope fallacy, because the rationale and criteria that I and others like me propose could not possibly be applied to nonmilitary factions due to the fact our very arguments appeal to the fundamental nature of a military, and not to the specific authority of player factions as an entire group.
Here's quote on my criterial rationale from a debate on another forum, for reference;
Me Wrote:Any faction that;
A. Owns the guard system
B. Is headed by a Fleet Admiral or equivalent rank
C. Calls itself the Rheinland Military, Kusari Naval Forces, Bretonian Armed Forces or the Liberty Navy
D. Is a military faction (RM, KNF, BAF, LN)
can enact such policies.
Though, "unilaterally named military faction" should partially replace the text of the 4th criteria.
Also, militaries/police are one of the few, if not only organisations where independents can possibly be totally shut out. Corporations can have affiliates, hired traders, sponsors, sponsored, incorporates, rogue shareholders. Pirates are very much free wheeling, and would undoubtedly have lots of gangs and subgangs. Corsairs are divided into numerous other major structures, fending brutally to survive and otherwise disorganised.
The Outcasts are a whole House, a whole civilization dominated by Dons and full of all kinds of people. Mercenaries, by their very nature, are independent. The BHG are more organised, but still not even close to the level of structure in a military. Freelancers, self explanatory.
Only militaries (even paramilitaries are typically fractured, such as the IRA, Real IRA, Provisional IRA and the like) are truly organized, monolithic and structured organisations and possess the *potential* (not the requirement) to be monolithic.