Murder Rates

I wonder if murder rates are really the best way to judge if a city is getting safer or more dangerous. I mean we have to be getting better at treating gunshot victim’s right? Medical treatment and response times going up would mean less people die from their injuries but less people dying than before does not mean the same thing as we are safer than ever before. I think medically admitted for gunshot (stab wound) wound treatment would be a better metric to track.