What if some people believe developing offensive "cyber war" capabilities in secret is immoral? Consider, for example, whether you would be opposed to someone

What if some people believe developing offensive "cyber war" capabilities in secret is immoral? Consider, for example, whether you would be opposed to someone leaking information as to whether one of the nuclear powers had nuclear capability in excess of what was publicly known? Oh, sure you can dance around the fact that the latter may be more of a violation of treaties, etc., but just because their are no treaties covering "cyber war" (correct me if I'm wrong), does not make it morally acceptable.