McGrew, believe it or not, I do know about the Environmental Protection Agency, the Food and Drug Administration, and the Occupational Safety and Health Administration. During the time they have existed, the areas under their purview have improved greatly in America. But assuming these agencies are the direct cause of the improvements is a logical fallacy (the fallacy of false cause).
These regulatory agencies came about because of popular opinion. The people cared about these issues enough to do something. Had regulatory agencies not been created, the courts would have created a solution. Common law systems are slow to react to changes, so it wouldn't have happened overnight. But the end result would have been companies self-regulating and more power resting with the people.
You claim that the existence of the EPA proves that courts were not sufficient to prevent pollution. I don't believe it. You accuse me of being illogical, but your arguments are based on emotion and construe temporal nearness as proof of causality. Society is constantly evolving. When enough people care about an issue, change will happen with or without heavy-handed Government intervention.
I'm sorry your grandfather was killed by his employer's negligence. The courts failed your grandmother if they didn't nail the company for having an unsafe workplace. But I don't believe their failure means that courts can't do the job. Look at the ACLU and its use of the court system to champion free speech. A non-profit organization could have done the work of OSHA just as effectively. Someone just needs to have a landmark case to set the precedent that employers are responsible for safety.
As a final note, I trust rich businessmen more than I trust Government bureaucrats. You think corporations are powerful? Only so long as their customers are satisfied. Henry Royce (co-founded of Rolls-Royce) built cars for the rich and died a man of modest means. Henry Ford built cars for the people and died a wealthy man. Free markets are democracy in action. You get to vote every time you buy something. Businessmen are rewarded or punished by the will of the people every day. What keeps bureaucrats in line? If their boss's boss's boss is appointed by someone who is elected by popular vote, what does that mean to them? I don't like that the people Congress delegated its power of regulation are immune to the consequences of their action. If you distrust businessmen (who are motivated by profits), then why do you trust bureaucrats (who are motivated by power)?