Suppose I have promised to keep a confidence and someone asks me a question that I cannot answer truthfully without thereby breaking the promise.
Conclusion (therefore)
One cannot be obliged both to answer all questions truthfully and to keep all promises.
Evidence
Suppose I have promised to keep a confidence and someone asks me a question that I cannot answer truthfully without thereby breaking the promise.
Obviously, I cannot both keep and break the same promise.
Evaluate
The argument is shooting down a potential moral principle as unacceptable because it would sometimes result in a contradiction.
You can't say we have to follow rule 1 and rule 2, if they will sometimes conflict.
Goal
So let's look for an argument presents something similar: - a conclusion that's like - evidence that's like, .