I think the whole point of the Vulcans from a narrative point of view is that they are profoundly unlogical. Their culture celebrates being logical, but doesn't explicitly specify what that means. One can do some things that seem very unlogical, but can turn out to be very logical from another point of view. They also value instincts and quick thinking, even when those things are inherently unlogical.
This all stems from their desire to minimize emotions, again something very unlogical. The desire itself is motivated by a deep fear of their emotions. Being basically a race with severe anger issues and not enough therapy, they once saw their world ruled by emotions. Those emotions brought about massive suffering and almost caused the species to go extinct. So in fear they turned to the suppression of emotions, in order to have their brains guide them instead of their hearts.
One of the aspects that some of the writers did better than others is have the Vulcans be aliens. They aren't just green blooded, strong, telepathic humans that want to suppress their emotions, they are aliens. On a fundamental level humans (including the viewer) can't understand them. We can make predictions and rationalize behavior in hindsight, but actually being a Vulcan is to be an alien from our point of view.
The whole internal conflict between what Vulcans want to be and what they actually are is one of the things that makes them so interesting, for me at least.