Regarding Glocks, Hi-Points, S&W, Colt and Taurus pistols: When I went with a group of others for the qualification course we had to take to work as Armed security in Louisiana, we had a mix of firearms. S&W, Colt, Springfields, Glocks, Hi-Points, and Taurus pistols. When it came time to qualify, I saw two pistols jam. One was a Springfield XD-40. The other was a Glock. I don't know the model, but I'm pretty sure it was a .40 S&W. Everything else, including the Hi-Points and my Taurus got through the qualification course without incident.
Why did those two jam? I have no idea. None of my Taurus pistols have ever jammed. And I can put all 16 rounds on target with little effort. Yes, I'm happy with those results.
Regarding cops and guards: I'll leave that to someone else, I'm likely to say something I'll regret later. All I'll say for now is I worked as a part-time LEO for a couple of years. It was "interesting."
As far as guns go, everyone has their opinion. You have yours, I have mine, so deal with it, ok?