If you have no access to the courts and no ability to enforce contracts because your business is illegal, you're left with only violence. But violence is a pai

If you have no access to the courts and no ability to enforce contracts because your business is illegal, you're left with only violence. But violence is a pain in the ass, so perhaps you're extraordinarily violent to a few people in the hope of scaring everyone else. People may also be sociopaths; such a business will strongly select for them.