Tiger shark in Liberty

[Hielor]

It must be made clear that Rheinland Military vessels are not allowed in their territory due to the ongoing war.

You're not asking for something to be "made clear," you're asking for something to be changed.

But civilians flying Rheinland made ships should be allowed into their space, since they won't pose a threat like military pilots.
I mean ... what would a Bretonian born pilot say who flies a Tigershark in Liberty and gets asked to leave cause his SHIP comes from Rheinland? As if it were a virus or something like that:D

The fact that they are flying a Rheinland ship indicates that they have some affiliation with Rheinland. Liberty doesn't want anyone with any Rheinland affiliation within their borders. There could be all sorts of reasons for this--spies posing as traders/freelancers, ships potentially concealing things harmful to Liberty, not to mention the very real possibility that Rheinland freighter is going to return to Rheinland at some point, possibly carrying goods from Liberty--a big no-no.

The restriction makes perfect sense to me.