There are ways to respond to a question without violating secrecy and being dishonest. It’s like pleading the fifth, there are situations where it is acceptable

There are ways to respond to a question without violating secrecy and being dishonest. It’s like pleading the fifth, there are situations where it is acceptable to not tell the whole truth because it is counter to a law or personal right. In those instances the person needs to explicitly proclaim the basis in which they are obscuring the answer. Giving untruthful, absolute answers about the non-existence of something is inconsistent with the above.