This is why you never trust a single source. For anything. Reputable news organizations have never trusted single sources, they always use multiple sources to verify information they are told. Science is not immune from this, and never has been. And even for those that you've followed in the past, times change, especially in a capitalist society with a massive oligarchy that owns the news companies, like modern western civilizations. Trust, but verify.

How often does this actually happen? The cases where this does occur stand out because they are rare. I really hate the implication that scientists are not trustworthy because some individuals acted in bad faith. Scientific fraud is real but it doesn't mean you can't trust science.