Do we really trust that a politician who finds them helpful is not going to overlook certain misconduct that is politically beneficial (e.g., suppressing the st

Do we really trust that a politician who finds them helpful is not going to overlook certain misconduct that is politically beneficial (e.g., suppressing the statements of their major opponents)? It's certainly not a forgone conclusion that investigations led by "friendlier" administrations are necessarily fairer. I doubt there's any way to have a purely unbiased investigation into an entity as prominent and influential as Google.