What we should be most concerned about are random or “stranger” killings. (For instance, I do not care about suicide, or intra-family killings, acquaintance killings, or drug deals gone bad - I’ll take my chances with myself, my family, my friends and my business partners.)
The numbers are likely quite small, although there are of course substantial questions about many killings - particularly unsolved ones. Here are some recent FBI stats (all murders are included, not just gun killings):
https://ucr.fbi.gov/crime-in-the-u.s/2014/crime-in-the-u.s.-2014/tables/expanded-homicide-data/expanded_homicide_data_table_10_murder_circumstances_by_relationship_2014.xls
My guess is that fewer than 2,000 (at the very most) random or “stranger” gun murders a year take place in the United States, implying that the chance of being killed in this manner is smaller than 1 in 150,000. As much gun crime is highly concentrated geographically, no doubt the overwhelming majority of people in the US face much lower odds, perhaps an order of magnitude lower.
Sure, no murder is “acceptable,” but we should understand the true scope of the probem before getting too emotional. Plenty of people remember when automobile deaths were over 50,000 per year, and even today are ~35,000.
Like it or not, the US is not Europe. By agreement, our rights are preexisting, and not granted by government. While plenty of people think the benefits of gun ownership are outweighed by the detriments, plenty disagree. In any event, rights are not subject to a mere vote anyway, and there can be no higher right than that of self defense.
BTW, I would welcome any better estimates of numbers than the very rough ones I’ve offered. This is also a useful article for thinking about the scope of the problem: https://www.nytimes.com/2016/08/18/nyregion/killed-by-a-stranger-a-rare-event-but-a-rising-fear.html