That’s a straightforward one to answer, I was killing bears for a living, and having a gun you don’t ever put down is insurance. I had to fly a floatplane and run boats around the territory in the course of that, and a long gun is a PITA in those scenarios, and unfortunately I couldn’t do my job unarmed. Would be like showing up to hockey without a stick and hoping nobody passes to you. Fishing in the same place I don’t carry ATC, happily rafted down one of the old rivers from the top with rum and bear spray instead.
If anything carrying 10mm only was an indicator of my dropping level of concern the longer I spent in the grizzlies, in the beginning it was .375 H&H all day every day. Then I tried a short 12 gauge, then went ATC as a better understanding of the risks became clear. I wouldn’t go ATC only on a follow up of a wounded grizzly, but that’s the only time it feels insufficient.
You know that is what is called complacency. At any industrial workplace that drum is beat on often.
Of course it has been known for a very long time that the Coastal Bears are fat and happy and much less aggressive than the Mountain Bears. One need only look at the attitudes of the Natives in the respective areas towards Bears. Same in the literature. Same in the news today.