honestly we live in an era where we have to be ready to be responsible for whatever we choose and do, outside intervention is only to strengthen our decisions, and in gambling everyone actually has the right to do and not do it with one condition as long as it does not harm people around. what is dangerous is when we gamble then get addicted to gambling and steal or commit other crimes for the sake of gambling, that is a very dangerous thing and it is unethical.
Why do we exists in the gambling system if not for us to settle our dispute and accumulate more winnings? Gambling is ethical because it conveys most important information that can lead to loss or winnings. In gambling, we don't run away from blames, risks, losses and responsibilities, we embrace them because it's who we're in the space. We can not be jumping from one end to another without having an actual knowledge of what we're targeting in the space. We are what we are today based on the choices we make in the system.