Vulcan is a society where their dogma is the teachings of Surak and a life of logic and emotional control. However, that philosophy is not critically reviewed. What if a Vulcan does not want to follow the teachings of Surak? Are they ostracized and cast out from society? If so, that undercuts the idea of logic and no emotion as a passive, peaceful ideology which unifies people. Indeed, it undercuts the very idea of diversity found in the IDIC.
There is also the question of if emotions really are that bad for the Vulcan people. The Vulcans blamed their wars on their lack of logic and emotions. It is not only a belief that logic and no emotion are better. It is a taboo to consider emotions because the Vulcans think they would lose total control, and would be shamed. But there is evidence that Vulcan emotions are no more passionate than a human. There's a lot of things that Vulcan characters say were true in the past, while speaking centuries after the time they are referring to. But when we see it on screen, and I may be wrong, I cannot remember a time where Vulcan emotions shown in their natural state (and not as the result of some "everyone's crazy too" mcguffin) have been different from normal humans. The Mintakans were not flying into homicidal, barely function rage. Sybok was misguided, but he certainly was not flying into murderous fits of rage. And there is the example of the Romulans, who specifically rejected Surak. Their government is a dictatorship and individuals and organizations of the Romulan Empire are very much the bad guy. But as individuals, there is no sign that they are, as a people, irrational and destructively emotional. They act normally, and are not like the descriptions of earlier Vulcans that later Vulcans describe. Which makes me think emotions are not so bad for Vulcans.
There is also the question of if emotions really are that bad for the Vulcan people. The Vulcans blamed their wars on their lack of logic and emotions. It is not only a belief that logic and no emotion are better. It is a taboo to consider emotions because the Vulcans think they would lose total control, and would be shamed. But there is evidence that Vulcan emotions are no more passionate than a human. There's a lot of things that Vulcan characters say were true in the past, while speaking centuries after the time they are referring to. But when we see it on screen, and I may be wrong, I cannot remember a time where Vulcan emotions shown in their natural state (and not as the result of some "everyone's crazy too" mcguffin) have been different from normal humans. The Mintakans were not flying into homicidal, barely function rage. Sybok was misguided, but he certainly was not flying into murderous fits of rage. And there is the example of the Romulans, who specifically rejected Surak. Their government is a dictatorship and individuals and organizations of the Romulan Empire are very much the bad guy. But as individuals, there is no sign that they are, as a people, irrational and destructively emotional. They act normally, and are not like the descriptions of earlier Vulcans that later Vulcans describe. Which makes me think emotions are not so bad for Vulcans.