Posted by The Wormhole:
In fact, "Kir'shara" even showed that Enterprise Vulcans were under Romulan influence. Case closed.
Well, what it showed was one Vulcan government official working with one Romulan operative, and doing things that only his long record of service to the Vulcan people could have allowed him to get away with.
There isn't any indication that the entire Vulcan population was under Romulan influence at the time. I tend to think the cultural issues were already there, and the Romulans became aware of them and merely took advantage, for their own purposes.
Best,
Alex