Consider this a reminder for people currently watching Star Trek, old and new.

Logic and controlled emotion aren't inherent to being a Vulcan. Somehow gaining Vulcan traits, or biologically transforming into a Vulcan, will not make you logical and emotionless. In fact, quite the opposite would happen.

Vulcans used to be warlike, barbaric (as Spock would describe them) and nearly wiped themselves out. It was the teaching of Surak in the philosophy of pure logic, after centuries of war, that made Vulcans what they are today. Vulcans do this by training logic and emotional control throughout their childhood and teenage years. Ultimately culminating in Kolinahr, the final stage to "purge emotion". But Vulcans still experience emotion, and their state of control is something that requires constant maintenance through meditation and practice.

Vulcans are far more emotional and passionate than even Humans. If a Human so much as houses a portion of a Vulcan's Katra (the mind/spirit), said Human would struggle immensely to keep their feeling under control.

I'm writing all this because I'm getting the feeling that this very important part about Vulcans is being forgotten (perhaps more-so by the current writers of Star Trek).