Vulcans are logical to a fault. But I have been watching the latest iteration of Star Trek and I keep wondering how Vulcans make decisions given that decisions are based on, at base, a preference.
For example - almost every decision I can think of is the will to perform an action (affect the world) for a (personally) desired outcome. The keyword is outcome. I change the world now so that in the future I get something that I want. So at base of everything people do is this desire.
How do Vulcans, hating emotion as they do, do anything but sit and stare at a wall? Do they have a list of prescribed wants that are declared "logical" or are allowed. As in, "I can perform this action because a perfect Vulcan would want this as it furthers the goals of Vulcans"? Even then this perfect Vulcan, seemingly being emotionless, would desire for nothing either.
Perhaps I do not really understand how Vulcan philosophy works, but it has me very confused. Can someone explain this to me?
EDIT: This is sort of a sub-question/point but I want to bring it up as well. If I remember correctly Vulcans split off from Romulans who are a cousin species that "give in to their emotions and are violent/have undesired traits (from the perspective of Vulcans)". This is seemingly another paradox - Vulcans practice logic because they fear (an emotion) using emotions and becoming like the Romulans who have undesired traits (desire is also an emotion). So to the extent that Vulcans practice logic as a reaction agains Romulan-"ism" they are betraying their own philosophy. Is this also incorrect, or am I missing something?