I think this comment wins a prize for "most creative way to explain away the massive difference in murder rates between the US and most other developed countries".
Vermont, New Hampshire, Iowa, Idaho, North Dakota, Wyoming (about 8 million people between them) all have murder rates lower than Canada, Belgium and Finland.
Maine, Minnesota, South Dakota, Hawaii, Utah, Oregon, Montana, Washington all have relatively low murder rates.
I'd love to hear your explanation for what causes the wide variance between some states on murder rate.
Louisiana for example has had a high murder rate for a long time (as has eg Chicago) and states like Idaho, New Hampshire, Maine, Washington etc have had low murder rates for as long as the US has had meaningful data on murder.
I'd argue the opposite, chance plays zero role when it comes to the wide variance in murder rates among states.