The increase in crime in the 60s and 70s didn't correlate with more guns, the decrease in crime in the late 90's didn't correlate with fewer guns.
There is clearly something going on in the US that drives crime that is not guns. Culture, welfare state, war on drugs, inequality, segregation, failure of the family. Better cases to be made on any of those things than guns.
I think the GP is correct to point out the gun thing too. Having lived in a place where guns aren’t as accessible and observing how people live, I’m sure there is some correlation.
[0] https://en.m.wikipedia.org/wiki/Lead%E2%80%93crime_hypothesi...
I didn't say they don't affect crime, but if crime spikes, then drops then spikes, while gun ownership remains steady, then it is a piece of evidence that crime is largely driven by something other than the quantity of guns.
Some people thrive on the empowerment, liberty and responsibility associated with these incredible death machines. But that's no reason to mistreat the data. For instance, the ratio associated with other death machines like cars, which have somewhat similar availability across the pond between US and Europe, is a more reasonable factor of 2/3.