I am of the belief that in many cases if not most cases toxic workers are created and that most workers hired are not initially toxic for that work environment.

I am of the belief that in many cases if not most cases toxic workers are created and that most workers hired are not initially toxic for that work environment. So the question I have is what are the company's doing that turns people from good workers to toxic workers? How do you turn a toxic worker or situation into a positive one? That seems like it would be cheapest solution.