The entire subtext of the script to "Amok Time" was that Vulcans were not as they claimed, or as Spock said they were.
Sturgeon was an observant man and a good writer. What he knew, and what any anthropologist can tell you, is that every culutre has their ethos and their models and archetypes of what the "good individual" is. And few, if truly any, live up in every way to those models.
Those who are seen to do so are often lionized - they are heroes and saints. But most individuals believe themselves to be somewhere "in the ballpark" - put simply, we believe that we're good, but most of us, sometimes, fear that we are bad or insufficient in some ways. Unless we're unbalanced - megalomaniacal, narcissistic, or otherwise pathological in our view of ourselves and others so that we see ourselves as the ideal or only standard.
Here's something, though: every functioning culture allows individuals a great deal of usually unspoken, unacknowledged leeway to fall short or substantially deviate from the ideal in their everyday behavior. Were it not so, the civilization would pull itself to pieces in short order.
In "Amok Time," every individual we meet on Vulcan is something other than the image that Spock has painted for us of what it means to be Vulcan. T'Pring is duplicitous, manipulative and emotionally driven, as is Stonn - when T'Pring switches the plan on him, he has an actual emotional outburst (for a Vulcan). T'Pau, "All of Vulcan in one package," is arrogant and dishonest - there is no other reason for her to withhold from Kirk and McCoy the rather crucial information that Kirk is agreeing to participate in a duel to the death.
It's laid out pretty clearly. There are Vulcans as they say they are, and Vulcans as one can see them to be in their real behavior - same as it is with human beings.
