So I try to research about deaths of boxer inside the ring,
https://en.wikipedia.org/wiki/List_of_deaths_due_to_injuries_sustained_in_boxingAnd i guess this is what the rounds was readjusted in the 80's. Before boxers fought at 15 brutal rounds but was reduced to the standard that we are using today at 12 rounds.
The infamous fight that comes to my mind is Mancini vs Duk Koo Kim who collapsed in the ring and die. Then after several months the one that referee the fight committed suicide and so is Kim's mother. And it still haunts Mancini up to this day.
The rules have been adopted a lot too to protect the boxers.
I think in the 60's they are allowed to slug it out until one of them drops but these days, when the referee sees that the fight is already one-sided and one player cannot defend itself anymore, it will be stopped and declared TKO. I think the Standing Count rule was introduced because of the death of Kim Duk-Koo.
There is lesser death these days but unfortunately, it may still happen because of the nature of this sport. True, but boxers who enter this game have to be aware of the risk, and he has to accept the risk. That's why they need to have the right training so they will be 100% ready and they can take the punches from their opponent. Referee has a big role in boxing, they have to make sure that they are doing their job well to protect the boxers and to make it a clean fight.