Perhaps we should be helping PAD out and correcting the little typo? The dialogue makes equal sense if it reads like this:
That is, the benefit of doubt is mockingly given to the Danteri for not necessarily understanding how the UFP would react, as a non-member might theoretically be ignorant of the ways of the Federation.
And this one
could be wishful thinking on Ryjaan's part, as he is postulating a future sequence of events and may be hoping that the future will bring along membership...
Timo Saloniemi
"Ryjaan. since the Danteri aren't members of the UFP, I am informing you that the Federation would consider it contrary to its best interests to have Danterian ships entering Thallonian space in any great numbers, inflaming an already inflammatory situation and stirring up hostilities."
That is, the benefit of doubt is mockingly given to the Danteri for not necessarily understanding how the UFP would react, as a non-member might theoretically be ignorant of the ways of the Federation.

And this one
"And you will let a member of the Federation - namely ourselves - deal alone with the security threat that the fallen Thallonian Empire represents?"
could be wishful thinking on Ryjaan's part, as he is postulating a future sequence of events and may be hoping that the future will bring along membership...
Timo Saloniemi