That's a heartbreaking story. It would be equally troubling regardless of when it happened, but the timing undoubtedly stained an otherwise cheerful holiday for a lot of friends and family. My heart goes out to the family and friends of the deceased...and equally to the gentleman who pulled the trigger. I can't imagine that regret.
I'll never understand these types of accidents. I'll admit that I've watched monster bucks turn into deadwood at first light and bushes turn into deer as light fades, but I'd never even consider aiming at something I couldn't see well enough to execute an ethical shot. These days, I rarely hunt with a firearm, but I live by the words my uncle told me when he handed me a .22 at age 4. He said, "This is a tool, but it's a deadly tool. Guns are not scary, but if you don't respect them, scary things can happen. It should stay pointed up or down until you know exactly what you're shooting at...and just as important, what's behind your target."
I'm not getting all preachy, but we can all do our part to avoid tragedy by making sure to emphasize safety over success to those we introduce to this amazing way of life. From firearm safety to treestand safety, the most important thing is that we all get home safely when we leave the woods. Wishing y'all a safe and happy end of the season.