Zamzow,I’m not trying to pick on you but you need to do some reading of reports and articles, less gun forums and fill you que with some real life experience. Once you do that if your opinion is for a 40+ cal then right on, its all about placement with auto handgun ammo anyway.
As far as 22lr, my BF died from one shot when I was 19, he was 20 in shape on meth and whiskey, smack dab in the middle of a small 400 person logging town so problems are the same everywhere.That being said I there was another shoot out about 300 yards from my house , guy I worked with was shot in the knee with a 115 FMJ 9mm and it deflected off of his knee cap,not a square shot, he returned fire and shot the guy I didn’t know in the hip with a 7mm mag hunting rifle and killed him, bled out.
Militaries have been killing each other with 9x19 for better than 100 years.
Here are a couple reasons to consider 9mm
Low ammo cost= low practice cost
Quicker follow up shots
More common, easier to aquire
And if you use high quality high pressure +P ammo the power is respectable. 12 inches being the FBI minimum penetration
And I think your theory that 9mm are only good for beginners is lame. I find that the more experienced people can do the job with most all calibers because the understand firearms, ballistics and shot placement.