And how is betting of people hitting each other being considered as legal and ethical in today´s world?
It's much better than countries going to war and in conflict, boxing is considered art in sports and Olympics you need to be physically fit and well trained to compete, they are trained to get hurt and hurt they are not average people they undergo training and they are certified to go on competition, and boxing is well regulated so they are not fighting to the death.
Boxers are not only thought how to beat the opponent, but they are also thought how to protect themselves at all times, and though it's normal that there are some boxers who suffers from serious injury, it's just rare compared to the total fights where boxers are still healthy after the fight.
So yes, there's no way it will be stop or ban as boxing is not the only sport that is considered a physical sport.
At the end of the day still we are focusing with the pointing system of the boxing no matter what happen if they want to try to defense still if the enemy has a large number of hints to the opponent has the chance to win the game this is the reason why even they are defending themselves still need to focus on hitting too because it's all about the points.
Boxing is already marked as one of the biggest sports that people would like to it's too hard if they want to try to remove this in the world of gambling.