In red above -
You're kidding right ? You telling me a .22 pellet to the back of the head, or the heart, or the neck or...........
Can't KILL ?
In blue above -
Maybe...
In yellow above -
A .22 firearm, vs a non-muffled, or badly muffled pellet gun aren't THAT much different.
You DID...miss the lack of pellet gun recoil !
So now, How...much better is a pellet gun to tech with ?
Mike
IDK, brother, that is kind of the whole point, a .22 PCP is less dangerous if only because I don't have to take him anywhere there are idiots and range officers. My pellet guns are heavier than my .22LRs so they are slower to move. I can interrupt a screw up or he can correct it before it is completed. But you are correct. There is more than enough energy to find an artery or crack a skull.
It doesn't take long to demonstrate that the .30 PCP (diablo and subsonic) hits harder than the Browning Buckmark with 22lr subsonic suppressed.
He has hit rabbits with the .30 PCP and he has seen what me using .22lr subsonic, suppressed will do to a rabbit and there is no comparison. Like Humperdink's fired wizard (played by Billy Crystal) said, "There is dead and then there is mostly-dead." There is no mostly-dead with the .30 on small game, there is only F'd in the A.
There is also the report of expanding burnt cordite that has a different quality than an air rifle. Not to mention, I will smell crappy .22 ammo the same way other people can smell that someone in the neighborhood is BBQing. There is a difference.
I don't use anything that is "badly" anything.

Actually that isn't true at the moment but I will be fixing it this weekend. I am having exactly as you mentioned a bad muff of a 0db on the .30. It is silent but I will be dam-d if I don't get at least one baffle strike every magazine.
Subsonic .22LR, in my own experience is not as accurate as .22 PCP. That said, I almost only use pistol for the subsonics.
My Delta Wolf in .30 has recoil. The recoil pisses me off too because I know I missed because of what I didn't do AFTER I pulled the trigger while the pellet was still in the barrel. Come to think of it, the Pneuma jumps more than the M&P 15-22 as well. The cricket .22lr does move more than any other .22LR that I have but not more than the DW .30 and that thing is 15lbs. lol
You make some fine points, friend, but you'll have to pardon me if I am not seeing how they move the needle on my decision making gauge of, "Am I taking anything away from my son's learning by teaching PCP instead of .22LR." I am kind of looking for an "Oh yeah, duh, I should have thought of that." moment from someone's comment. So far it seems that most are leaning toward teaching with PCP. We are on a airguns board so that might have been obvious, but I have a feeling most of us learned on real guns, right? Even though we may have had bb guns first we didn't learn the sport, or the love of it, until we got our hands on at least .22, you know?