Unbiased approach to a unionization situation

As a human resources (HR) director, you have an obligation to abide by labor laws and do what is best for both the organization and the employees. However, many people have personal opinions, whether negative or positive, about labor unions and the unionization process. Do you think it is possible for a HR leader to separate one's personal opinion regarding unions and ensure a completely unbiased approach to a unionization situation? What advice would you offer someone in this position?