Whistle blowing journalism implies you are reporting on acts breaking the law.
Reporting things that are juicy but not illegal, is effectively gossip / tabloid material.
You don't get to break the law in order to effectively gossip.
Case in point. You don't get to break into the King of England's cell phone to report he's infertile, even if you think means English citizens have a right to know that the country will never have a Prince-heir.
That is not legitimate journalism, and its certainly not whistle-blowing. Its repugnant and tabloid journalism.
Personal privacy is never second to the mob. Period.
EDIT: unsafe, fraud, abuse, corruption, malfeasance of government/company funds, are almost always also breaking fed/state/opco policy or regulations, and as such they are illicit and fall within the spectrum of whistle-blowing.