I started to respond with a small list of bar killings, but decided it was obvious. (Many reports didn't list a cause (beyond "disagreement").) I did run across a bar killing that was thought to be related to a LSU - Alabama football game a few years ago, and a killing related to whether a particular college basketball coach was considered good or not. Also a bar killing related to an arm wrestling match. (I did run across a fatal stabbing related to mask wearing that wasn't mentioned in the posted article.)
Killings too often happen over disagreements that seem inconsequential. I'm sure negligent homicides occur related to even more inconsequential things.
Sobering lists: Every
homicide victim in Chicago (2018, 2019, 2020).
Multiple (4+ victims) shootings in the US.
NYC crime stats shows some dramatic increases & dramatic decreases 2020 vs 2019.
Whether you want to blame global warming, anxiety over COVID, lockdowns, economic consequences of the pandemic, increased polarization of the populace, Trump, "them" (for any value of "them"), or the alignment of the planets, there are some troubling numbers in there.
I feel like putting up a couple of polls:
1) Did you read any other articles besides the one in the original post?
2) Do you believe the disagreement was primarily about wearing/not wearing a mask, or something else?