The issue is viewed in content of overall murder rates and international murder rates, its misleading.
The good news both Americans and brits are significantly less likely to be murdered than we were 20 years ago, that's by guns, axes, poison, cars, or darleks.
The number of guns in US society does not effect that downward trend on me way or another.
The difference is in the level of murder specifically gun murder rates, the shape of the stats is very much the same.
Understanding context gives most stats meaning.
Picking two correlating pieces of data at points that best show the point you always wanted to make usually gives a distorted perception.
Ok not quite the graph I described but you see the trends
That will be shrugged off as irrelevant by a few chart-citers here.