Is this an inappropriate workplace and why would an employer be so partial to their employee?

– the therapist, the supervisor and the employer aren't related – the therapist has the best room with art supplies in the suite and is given the “easiest” clients, especially the children – the therapist just listens and doesn't give any evaluation or feedback to any of their clients – the therapist has yelled at clients before. The other clients and employees outside the room have heard the therapist yell at clients before – many people have made complaints about the therapist, but the employer and supervisor doesn't take any of their reports seriously or take any action against the therapist Do you think there could be any possible blackmailing from the therapist? Is it possible that the employer owes the therapist something no one else is aware of?