Most instances of whistle blowing are situations where a person has promised not to reveal something and then decided to. Situations like that are necessarily a

Most instances of whistle blowing are situations where a person has promised not to reveal something and then decided to. Situations like that are necessarily an ethical trade off - the person doing the whistle blowing has decided that keeping their word is less important ethically than revealing the secret but this is a very subjective decision that different people (and ethical systems) can and do have different opinions on.