Boxing has to have stricter rules than other sports because it is so much more dangerous. Injuries happen in other sports but they are accidental. In boxing the injuries are the point of the sport and they are much more serious. In spite of all the regulations, deaths and serious injuries take place every year in boxing. And they happen in amateur fights as well as professional ones, so headguards seem to make little difference. Clearly it is not possible to control boxing well enough so that it is safe. The only way to make boxing safe is to ban it.