New gun owners are less skilled because they are new to gun handling. Because of Glock's aggressive marketing, many new gun owners, with no training beyond what they saw in the movies and were told by the guy behind the gun counter chose a Glock as a first pistol.
A good explanation of your position, and one that I happen to agree with from my own observations locally. Many of the newbies coming into the gunshops are directed towards the Glock section, or almost as frequently towards the XDs. Later, I sometimes see the same newbies at the range being stupid. Just look at THR. A soon-to-be first time gunowner introduces him or herself, looking for their first firearm (could be a shotgun, it doesn't matter) and within the first 4 posts someone will say "Get a Glock."
As you said, it's not the gun, it's just the sheer number of people buying them, particularly first time gunowners.
This is the same reason why, per capita, you see more Ford Mustangs and Chevy Camaros wrapped around telephone polls than Corvettes or 911s. Usually, it is a younger, less experienced crowd with the Mustangs or Camaros, so it stands to reason that they would be involved in a higher percentage of crashes than other high performance cars that a purchased by older, more experienced drivers. It's really not the car, just the clientell who buys them.
Perhaps not the best analogy, but it kinda works IMO.
And before I get flamed, I quote XavierBreath's post above:
The Glock doesn't make a person less skilled. A person is not less skilled because they carry a Glock.
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How do you field strip a Glock?
Don't you remove the magazine, pull the trigger and then take the slide off?
Oops, forgot to clear the chamber.
Dang it, I hate it when that happens.
XD is the same way, and it was something that ALWAYS made me nervous. I would check the chamber many times before proceeding with the field stripping. Often, I'd ask someone sitting nearby to double check along with me. Paranoid? Maybe, but I have yet to have an ND (knock on wood).