The Washpo digging on Roy Moore, the NYT digging on Clinton Foundation, etc. these are experienced reporters having 15-30 credible sources, evidence etc. every time this happens, everyone denies and slowly little by little the story finds more evidence and facts and it becomes true.
This is why a free press is soooo important
Why would Apple disclose that millions of their products could be hacked and you’ve lost all your privacy. Who would trust them? They’d lose billions, regulations would come etc. it’s in the best interest for every party to deny.