Now, let's address that 100% or near 100% stop rate for firearms (not just handguns). This is a list a buddy helped put together with me over several days.
Bear was shot and killed but managed to kill the shooter before dying.
https://www.newsweek.com/bear-man-kill-each-other-clash-turkey-1721337
Bear was shot and managed to kill hunter who shot it...
https://www.newsweek.com/dying-bear-killed-russian-hunter-shot-crushing-skull-1717972
Uptain incident. Neither client nor Uptain had gun on their person. Bear attack happened. Client gets to horses to get Uptain's Glock pistol, but can't make it fire. So he tossed the gun to Uptain who was fighting a bear. Apparently, the mag was unseated and Uptain could not get gun to fire. Client ran to safety. Uptain discharged bear spray and traveled some 50 feet before collapsing. Apparently, the bear spray worked as the bear was chased off, but Uptain had already suffered fatal injuries. This is a story that was claimed to be a bear spray failure, but it isn't.
https://www.guns.com/news/2018/11/27/fatal-wyoming-bear-attack-no-round-in-the-chamber-on-handgun
https://bloximages.newyork1.vip.tow...-51b4-a9b4-dd9a247c83ec/5c51dbd49158b.pdf.pdf
This next event was argued as a bear spray failure, but not a gun failure, despite the fact that it is also a gun failure. Orr was hiking and was attacked twice by a bear. It was a gun failure for the same reasons bear spray is said to fail, hunter was not able to deploy it effectively and didn't bother. This experienced trailsman made a lot of mistakes. Why carry a scoped hunting pistol in bear country when you aren't hunting??? He was hiking and "scouting" for elk.
https://globalnews.ca/news/2978646/...eo-after-surviving-2-attacks-by-grizzly-bear/
He has all sorts of excuses for not being able to use his gun...
http://www.thetoddorr.com/2016/10/10/common-question-why-didnt-you-shoot-the-bear/
Interesting that he claims the gun would be hard to aim with a scope, but he had custom mounts so that he could use his iron sights. Hmmm.
"The scope was in a custom mount made by Todd, that allows use of the open sights under the scope."
https://www.ammoland.com/2018/02/double-bear-attack-survivor-interviewed-at-shot-show/#axzz81mh224wr
Woman shot by her husband as she was being mauled. Probably won't hear about anyone being killed by bear spray.
https://www.cbc.ca/news/canada/north/yukon-woman-mauled-bear-died-gunshot-wound-1.3378411
Bear hunters shot bear and then tracked wounded bear. Bear attacked one of the hunters. The other hunter shot the bear, killing the first hunter. Again, bear spray doesn't usually kill. You could say it stopped the attack, but that would be a bad argument given that the victim was killed by his buddy.
https://www.reuters.com/article/us-...n-during-grizzly-attack-idUSTRE78N0H220110924
We discussed it here at some length...
https://www.thehighroad.org/index.p...led-by-friends-bullet-not-bear-attack.616679/
Man was killed by a bear while field dressing a moose he shot. Since he shot the moose, he had a firearm but either couldn't or didn't access it.
https://www.wctrib.com/news/tragedy-strikes-family-twice
Had a rifle. Some sources say he managed to fire it.
https://www.cbc.ca/news/canada/calg...naskis-hunter-killed-in-bear-attack-1.2760221
Had a firearm. Discharged it. Died.
https://www.cbc.ca/news/canada/calgary/missing-calgary-hunter-mauled-by-bear-1.658839
Shot the bear but still died. Not clear if the shot was fired in self-defense.
https://akfatal.net/Rasmussen 11-01-99.htm
Hunted bear shot, then killed hunter when hunter approached bear he thought he had killed. Bear killed by other hunters after killed first hunter.
https://www.adn.com/alaska-news/wil...hot-near-anchorages-ship-creek-official-says/
The charging bear was shot twice but the victim was still mauled. He was using a .375 H&H. Maybe not enough gun?
A third shot from another person on scene ended the attack, killing the bear.
https://www.adn.com/alaska-news/article/alaska-bear-attack-shot-too-late/2010/11/05/
Guy was hunting so he presumably had a firearm.
https://apnews.com/article/210c16a73d3fae5eb11e6f3e0f953d5e
Monty Adams Hunting sheep so presumably he had a firearm.
http://www.southeasternoutdoors.com/wildlife/mammals/fatal-brown-bear-attacks.html#:~:text=Alberta - Monty Adams, 32,,but died during his evacuation.
The same would be here. These guys were moose hunting. Killed one. I assume they had guns. One managed to be killed by a bear and the other managed to shoot a bear and it ran off.
This guy did really well. He shot the attacking bear, but also shot himself. However, maybe this should not be here because he was successful in driving off the bear, LOL.
https://www.usatoday.com/story/news...self-grizzly-bear-attack-wyoming/10588377002/
Another gun failure and success story. 77 year old father hunting with guide son. Father is attacked and his face savagely mauled. Son killed the bear. Ostensibly, they both had guns, but the elder failed to use his. He was in shooting position when attacked.
https://www.recoilweb.com/surviving-bear-attacks-life-or-death-decisions-178092.html
https://www.themeateater.com/listen...ages-that-shocked-the-internet-with-bret-bohn
Horrific Images here...
https://medihelp.life/77-year-old-attacked-by-a-bear/
This guy had his rifle ready, seeing the bear stalk him as he bathed previously, but was outflanked by the bear and managed to not shoot it.
https://www.dailymail.co.uk/news/ar...ive-I-forget-powerful-animal-charging-me.html
Guide and hunter fired twice, but bear still mauled him. He was one of multiple hunters chasing the bear with dogs when the bear came after him AFTER he had downed it with the first shot...
https://www.pressherald.com/2010/09/15/bear-attack-all-kind-of-a-blur_2010-09-15/
https://www.bangordailynews.com/201...survivor-lsquoit-was-all-kind-of-a-blurrsquo/
Plenty of bears failed to be stopped by firearms, either because people hit and the bear is unphased, missed, shot themselves, shot another hunter in the process of 'saving' the hunter, shot the bear and both bear and hunter died, accessed gun but could not fire it, had gun but didn't bother to try to use it, dead bear was not dead, etc.
Firearms are absolutely great for defense and I am not claiming otherwise. However, contrary to claims of being nearly 100% effective, that is WAY TOO GENEROUS.