The point of most sports where you can die is to avoid the dying part, not just boxing. Pretty much every sport has not doing the things that can cause dying as a pretty good strategy. The one you mentioned is actually an exception, where the thing is an integral and mandatory part of the sport. Even football, where you can get yourself rattled up pretty good by getting tackled, recommends you probably don't get tackled. It just so happens there's quite a bit of that.