Hell, I took a nail straight through my hand once. Stupid carelessness on my part, but a direct hit to the part between my left thumb and forefinger. The end came out near the base of my ring finger. Didn't even break the bone. Instead it ricocheted off of the bone and slid across my palm instead. Severed the nerve to my index finger, which required surgery, but I could have gotten away with not even going to the doctor if I was willing to live without any feeling at all in my finger for the rest of my life (I have partial feeling now).
If you taped down the safety, you probably wouldn't do much damage at all. Actually, with some guns you don't even need to tape it down. The hitachi's that I used to use could have been shot with one hand if you knew how to hold the part of the safety that allows the trigger to work while operating the trigger. It was easy to do, and I could show you in two seconds if we had the gun in front of us, but I don't know how to explain it easily in words. For ****s and giggles sometimes we'd have shooting competitions with them during coffee break, shooting cans and ****. You'd be surprised how hard it was to even pierce an empty aluminum can with one of them from any distance. Like I said, they flip. You'd have to get lucky by having it flip to the point right as it reached the can in order to pierce it.
Anyway, my point is at any distance over 10-15 feet, you'd probably sting anyone you shot at more than wound them, and you probably wouldn't draw blood more often than not. That's provided you even hit them from that distance, because, again, they are far from accurate.
Whereas a .38 snub will do a ****ton of damage from 10-15 feet. Overall, it's pretty damned easy to see why people would be more nervous of a gun in their home than carpentry tools, IMO. Frankly, I find it odd that you are a carpenter and a gun owner who cannot see why people might think that way. If someone was completely clueless about the realistic amount of damage a nailgun could inflict from 10 feet away (which ain't all that much different from the damage a bb gun could inflict from that distance) compared to a realistic amount of damage a .38 could inflict from 10 feet away, I could see thinking they are comparable, buit not someone who has experience with both tools.
You could kill a family of four in less than a minute with a .38 from about 10 feet away. You'd have extreme difficulty killing just one person from that distance with a nail gun if you shot at them for hours, if not days.
On top of that, if you are coming into a person's home to perform a specific task, you are assumed to be competent in that field. You do not deserve the assumption of competence in any other realm, though, and that includes the realm of firearms safety. Nor should anyone be expected to simply accept your word that you are competent in that regard.