Either because the sociopaths are in charge or we have to have laws aimed at controlling them but endured by us all.
I'm thinking of people like careless employers or heedless industrialists, and everyone else who will not operate ethically unless there is a law forcing them to - and even then they will be looking for a way round it.
At the extreme are the terrorists, but there are also the more mundane like manipulative, unpleasant people in the workplace.
Are the rest of us too ready to settle for our own normal circle of friends, family and colleagues. When will the meek get a fair go?