Since Glock is the most popular single maker of law enforcement semi-autos, and since law enforcement officers are the people who most commonly carry weapons on a daily basis, it would make sense that there are more ADs with Glocks than any other, just because there are more opportunities for an AD.
30 years ago most ADs were with Smith and Wesson revolvers - not because S&W revolvers are unsafe, but because that was the weapon carried by the vast majority of LEOs.
Having said that, personally I wouldn't recommend a semi auto to any novice especially for self defense. IMO a revolver is a much better weapon for self defense, especially if the person has little desire to spend a lot of time training with the weapon. A revolver is a simple "point and shoot" weapon whereas even the most reliable auto in the world requires a bit of training and practice to handle and shoot safely.
Back in the late 80's when police departments started switching from the revolvers they'd carried for a century to semi-autos, many civilian shooters started assuming that autos were "better" (after all, the police only want the best, so why not use what they use?) But I think this is not always the case.
I'll admit to a lot of revolver bigotry. It probably comes from my dad. When he was sent to Vietnam in 1966 he was encouraged (or at least allowed) to bring his own sidearm. He got a Smith and Wesson Model 15 in .38 special because he had been on the range with other shooters using .45's and noticed how many times they had "alibis" when shooting at the range. Well, dad knew that in combat there were no "alibis" so he wanted something that would go "bang" every time he pulled the trigger.
He even broke regulations to carry it - apparently when he was there the rule was that nobody was allowed to take weapons into Saigon. Well, dad just put his pistol in his holster, taped it to his lower leg with 100mph tape (military duct tape) and bloused his pants over it so he wouldn't be unarmed!
As a kid growing up, whenever we'd go camping or on a long car trip, that .38 was always in its holster under the drivers seat. He still has it and it still shoots great!
As for me, I bought a Smith and Wesson M-19 revolver in 1985 for about $250 and I still have it - it's one of my favorite guns and one I'll never give up.
A revolver has a number of advantages for an "emergency" or "fire extinguisher" type of weapon (that is, a weapon that, like a fire extinguisher, you don't really think about until you need it.) You can keep a DA revolver fully loaded and all of the springs will be at rest (unlike an auto which has a compressed magazine spring and a compressed striker spring or hammer spring if it's a single-action.) You can pick up a revolver and tell instantly whether it's loaded by the presence of the cartridge rims visible behind the cylinder. You can load and unload a revolver very easily and in the case of a DA revolver, it's pretty difficult to have an accidental/negligent discharge with a revolver unless you're doing something pretty stupid.
Autos do have some advantages - they are faster to load, carry more ammo and are easier to conceal. But for most casual users, the first two advantages aren't really that meaningful since most of us aren't anticipating engaging in protracted firefights.