Why do you say “Glock?” as if to imply there is a design flaw with Glocks? They are used by scores of military and law enforcement professionals across the globe and are pistols known for their reliability. In fact, most polymer, striker-fire pistols being made today are nothing more than copies of the basic Glock design. Many modern pistols like the popular S&W MP Shield are available with no safety. Wheel guns, in general, have no safety — the S&W Airweight has no safety or external hammer. The basic rule of thumb with any firearm is to keep your fingers off the damn trigger — and when you carry a Glock, keep the trigger protected in a proper carry holster. Additionally you can also choose to not keep a live round in the pipe.
There is a design flaw in Glocks, though Glock will never admit to it because of their motto: “Perfection”.
One should never need to pull the trigger on any gun except to shoot it. With Glocks, the trigger must be pulled for takedown. That is a design flaw.
I don’t know whether Glock has a design flaw or whether it works exactly as designed. I do know that whenever I read or hear about a LEO who accidently shoots himself, the weapon is almost always a Glock. In addition, I understand that pulling the trigger is SOP for Glock takedown, and that doesn’t seem like a good design feature to me.
Wheel guns generally do not have a safety other than a transfer bar, and my experience, an additional safety is not required because of the heavy trigger pull, particularly the Ruger LC101 class.
Carrying a weapon without a live round in the pipe makes the weapon about as worthless as a cell-phone in a crisis situation where mere fractions of a second can mean the difference between life and death. Racking the slide on a semi-auto adds another second to the self-defense process, and that could prove deadly.