On cases I've personally been involved in I've seen multiple incidents of empty guns on dead criminals shot by other criminals, including extended mag Glocks and AK pistols. I have seen zero incidents of random violence where the good guy died due to lack of ammunition. For random crime, I am well satisfied that the difference between 5 shots and 8 shots and 10 shots is negligible in all but the rarest of incidents, and even less if the good guy makes good hits.