hmm please elaborate....
Good guys and bad are products of their environment. In days of yesteryear, each town had it's own law. They simply hired a sheriff or town marshall who needed to be as tough or tougher than the outlaws, and weren't regulated by the county or state (or territory) to the extent they are today.
Neither were US Marshals, Texas Rangers, etc. where deadly force and treatment of outlaws was concerned. A trail boss could hang a cattle or horse thief from the highest cottonwood and chances are he'd answer to no one.
Obviously, todays LE has all kinds of regulations to obey. Federal, State, County and even City. Even department regulations.
All have one thing in common. Law enforcement did, and does, arm themselves with modern weaponry.