You'd have several fine episodes right there if Seska got to stay on the crew as an unmasked Cardassian and Tuvok's betrayal was actually exploited as it should've been.
Tuvok's betrayal? He was on a military mission to gather intel and report on their intentions. Tell me the Maquis didn't have such individuals doing the same thing. Would you call a G-man or any undercover law enforcement agent who infiltrates a suspected criminal or terrorist organization someone guilty of betrayal? Gee, I hope not. While the target of Tuvok's action didn't fit either of those descriptions, they were superlatively zealous representatives of a cause that the Federation reasoned that they couldn't countenance given the dynamics of the circumstances that were at play at that time. So, their operation had to be dealt with, end of story.
All's fair in love and espionage.
Oh, getting back to Seska, I don't know that part of her intention, as it developed, wasn't to actually inject a nascent representation of Cardassia as being a worthy ally to powerful species in the DQ, with the thought that in so doing she would give the Union a leg up in its eventual foray there and also accomplish a feat that would only redound greatly to her own benefit when she got home. I'm certainly not saying that she was resigned to spending the rest of her life there, far from it, as she likely considered some advanced race capable of getting her back long before Voyager, if they were even ever successful, given her opinion of Janeway's acumen. Meanwhile, she could lay the seeds of a Cardassian presence and predominance amongst its foes, that would likely yield immeasurable benefit down the road.
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