The very concept of constructing rules and limits seems to evade you.
Even in actual warfare, throughout history, nations have attempted to enforce rules (with varying levels of success) on things like WMD’s and intentional targeting of civilians. Contrary to what is believed, it was the breakdown of these rules, and not simply technological advancement, that led to the unimaginable casualties experienced in World War II.
Now of course that’s “real life”. Not a game played on an indoor sheet of ice. Clearly if negotiation and limits are routinely pursued in military settings, it makes more than enough sense to try to put limits on actions that lead to unnecessary damage in the context of a game. Of course, you’ll never eliminate physical risk in a contact sport. But your insistence that hockey fights are somehow inherently no holds barred anarchy is based on little more than your own selfish demands for entertainment regardless of the cost (none of which you of course will ever need to bear).