You always have to weigh things against each other. Is whistle blowing unethitcal if it exposes a greater evil? No. This is the case with every single possible

You always have to weigh things against each other. Is whistle blowing unethitcal if it exposes a greater evil? No. This is the case with every single possible action, not just disobeying your boss in secret. Is murder unethical? If it saves the lives of 100 people, maybe not.