A whistleblower has demonstrated that there are circumstances where they will short-circuit the chain of command and attempt to attract external intervention. The only way a corporate hierarchy can react to such a person is to see them as a risk to be managed; ideally by not hiring them. Large scale corporations have hiring processes with all sorts of weird informal risk-mitigation measures built in (which is usually expressed as discrimination on weird traits).
So people with that sort of whistle-blowing initiative who want to be employable need to build a strong informal network of people who will hire them because they think they understand what circumstances would trigger that behavior and that they are not present in the hiring corporation.