Statement: I think it's likely that people like X will often do Y because of Z.
This does not mean that all people like X will do Y--it only means that I
think it's
likely they will
often do it.
This does not mean that all people who do Y are people like X. For example, if I say that drunk drivers often run off the roads and wreck, that doesn't mean that everyone who runs off the road and wrecks is a drunk driver. They may have fallen asleep, they may have been texting, they may have just been inattentive.
This does not mean that everyone who does Y does it because of Z. For example, if I say that farmers often buy pickups because of their utility, it doesn't mean that everyone who buys a pickup does so because of its utility. Some people may buy them just because of the way they look.
Hmmm..... I don't know. I shoot IDPA with my 44 mags. I have lots of training too.
I didn't say that everyone who buys and shoots large caliber handguns does so because of lack of training. I didn't say that the primary consumers of large caliber handguns are untrained people.
There are clearly people who choose large caliber handguns for reasons having nothing to do with lack of training. There are certainly trained people who choose large caliber handguns. There are certainly many reasons that people might choose large caliber handguns for reasons other than a hope that it will make up for a lack of skill.
For what it's worth, my nightstand gun is a 10mm. I had a very specific purpose for picking that caliber for a nightstand gun that had nothing to do with either a lack of training or skill--and, in fact, nothing to do with anything that has been discussed on this thread.