I'm not sure about the 80% number, but I know the number is certainly high.
> Can, but not usually. It's more likely to be a crime of passion.
Crimes of passion require opportunity for that passion. They tend to not occur with people you've not been in the vicinity of. If you're in a more densely populated area, you're more likely to be in the vicinity of more people and know more people. It's not necessarily causal, but it is an emergent statistical phenomenon.
> You're conflating necessary means to commit a single occurrence with population level causes. I'm questioning whether population density is a cause of murder. Which I don't see why it would be.
The narrative is that the political leadership is encouraging/enabling/whatever criminals, not victims, who reside in the area. If you are arguing that geography doesn't impact the distribution crime, then the victims would be spread throughout the country.
It's not that population density causes murder, but it affords more opportunity.
I think we all understand that murderers are much more likely to know and live near their victims. It should not be surprising that more densely populated areas would have a higher murder rate. What is surprising is when the less densely populated areas have the higher rate.