In the earliest days of OHS, disputes of who was responsible for the payment of a workplace injury or illness was settled by litigation. Every US state eventually passed workers’ compensation insurance law to establish a no-fault system where responsibility for injury/illness payment nearly always falls upon the employer.
Whether there is an overpopulation of lawyers in the U.S. is debatable. The more complex, diverse, and open a society is, the greater number of lawyers are necessary to help resolve disputes.