I have trouble understanding what people mean when they use a phrase with the word exception. To me it sounds like a contradiction. So my question has two parts:
A) Is using the term exception ever legitimate?
B) Does the term "except" usually contradict the general rule
that comes before it?
For example, All ice cream should be taxed, except vanilla.
This seems that the quantifier "all" is false if a member is excluded. For example, All students passed the final exam except Roy.
Seems to me this means only Roy failed the final exam and the quantifier "all" makes the sentence false.
Please help me make sense of the term exception. Thanks for your help.