After I read this, I was curious about long term rates in the US. Yes, the rate for homicide in 1950 is the same as 2014 (5.1 according to Statista) between those dates however, are huge increases, almost doubling in 1980 and not back to 5.1 until 2014 and then rising yet again.
In 2019, there were six deaths by homicide per 100,000 of the population in the United States, compared to 5.9 deaths by homicide in the previous year.
www.statista.com
There are multiple factors involved, so it is difficult to parse out the causes or coincidences, but here is the abstract from one study thar looked at it:
A dramatic rise in homicide in the latter half of the 1980s peaked during the 1990s and then declined at an equally dramatic rate. Such trends in homicide rates can be understood only by examining rates in specific age, sex, and racial groups. The increase primarily involved young males, especially black males, occurred first in the big cities, and was
related to the sudden appearance of crack cocaine in the drug markets of the big cities around 1985. This development
led to an increased need for and use of guns and was accompanied by a general diffusion of guns into the larger community. The decline in homicide since the early 1990s has been caused by
changes in the drug markets, police response to gun carrying by young males, especially those under 18 years old, the economic expansion, and efforts to decrease general access to guns, as well as an increase in the prison population and a continued decline in homicide among those over age 24. The lessons learned from the recent homicide trends and the factors associated with them have important implications for public health and the criminal justice system.
The most dangerous states, with the highest murder rates are those with lax gun laws. The safest states, with lowest murder rates, are those with strict gun laws. That trend is across both urban and rural counties. BUT which area (including individual cities) is safest depends on who you are.
There is a very interesting bit of research I recently read that looks at gun violence from the view of culture and uses county level data to look at trends and examine rural and urban trends.
Nationhood Lab
Using 1950 alone as a benchmark is deceptive when taken in isolation and it only looks at the trend in the US as a whole.