Destiny 2 and Marathon developer Bungie is currently being sued for retaliation and wrongful termination by a former HR manager, who alleges she was let go when she raised a potential case of racial discrimination to her supervisors.
I would hope that the person hired to address discrimination would assume the report of coninued discrimination is correct.
They should assume it’s true for the purpose of more investigation. Then decide if the facts support or disprove the claim. That’s much different than hearing it from one person, and then concluding that it’s true.
Note that they believed it enough to raise the concern to someone higher up and that person took the existence of the complaint personally. That is doing exactly what you said, taking the complaint seriously enough to look into it.
They should assume it’s true for the purpose of more investigation. Then decide if the facts support or disprove the claim. That’s much different than hearing it from one person, and then concluding that it’s true.
Note that they believed it enough to raise the concern to someone higher up and that person took the existence of the complaint personally. That is doing exactly what you said, taking the complaint seriously enough to look into it.