Both sides of this issue have been pretty much raised on this thread. Having used a Glock, I know it has some great qualities, plus I tend to shoot pretty well with it. That said, it's a gun that probably should be carried without a round in the chamber and stored that way as well. And though I normally don't like magazine safeties, the Glock should probably have one. If, in a scuffle for your gun, the magazine safety lets you hit the magazine release, then the gun can't be used against you. When cleaning the gun, it also would prevent accidental discharges once the magazine was removed. An external safety on the Glocks seems like an obvious good idea, as well, but Glock has consistently resisted it. But why? Cocking the gun and walking around in ready condition with the pistol stuffed in a holster seems to me to be an accident waiting to happen. This is what many gun owners find unsettling about concealed carry and striker-fired pistols in general. On the cheaply made striker-fired Raven .25acp and Jennings J-22 pistols (both excellent pistols capable of great reliability), the manufacturers were very adamant about not walking around with the pistols in ready condition. You carried it until you needed it,
then you jacked a round into the chamber. Keeping the firing pin spring under constant compression didn't seem like a good idea.
Hammer-fired guns are much better designed guns, but more expensive to make, yet I see plastic striker-fired guns with no effective safeties going for at least as much as good hammer-fired pistols. The logic of that, frankly, eludes me. A hammer blow by a high density spring (similar to that in a revolver) seems to be an obviously better idea than using a design that incorporates a long, low density spring that requires more frequent replacement. Then comes the safety issue. I just don't see any advantage of carrying a striker-fired pistol, personally, but they're here to stay.
By the way, regarding the fellow who accidentally shot himself in the car with a Glock and lived, here's a story from 2011 where the Glock owner wasn't so lucky.
A Spotsylvania County man inadvertently shot and killed himself Sunday in the parking lot of a Giant food store where he and his family had gone to return a movie, authorities said.
The 45-year-old man apparently reached down to buckle or remove his seatbelt and inadvertently pulled the trigger on a Glock 40-caliber handgun he was carrying, said Capt. Elizabeth Scott, the public information officer for the Spotsylvania County Sheriff’s Office.
The weapon fired a round into his hip, delivering what would prove to be a fatal wound, Scott said.
“He’s undergoing an autopsy right now, but ... it obviously hit a major artery,” Scott said.
The man had gone to the Giant store, in a shopping center at the intersection of Plank Road and Harrison Road, about 4:45 p.m. Sunday to return a movie to a Redbox kiosk, Scott said. She said his wife got out of the van to drop off the movie, but at least two children were inside when the round was fired.
Again, these types of discharges just don't happen with hammer-fired pistols, or even striker-fired pistols that don't put the "safeties" on the trigger. These things should prompt Glock and other manufacturers to put real safeties on their pistols. Just jack a round into the chamber, activate the safety and snap it off if you have to fire.
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. No? BTW, reinforcing that assumption...there I go again 
