Glocks and other striker-fired semi autos don't typically have triggers as light or with as short a pull as revolvers in single action. What's more, they have a mechanical lever in the middle of the trigger to prevent AD/ND when the trigger is manipulated by accident. Even then, there are plenty of AD/ND events attributed to striker-fired pistols without safeties. Single action semi-auto pistols have a half-cock notch (think Eastern bloc Tokarevs, etc.) or a safety, or are not designed to be carried (e.g., race guns).
Grobin, you would not be welcome to shoot anywhere near me if you were carrying a cocked revolver. I repeat my assertion that carrying in that manner is not safe, and should not be endorsed by anyone practicing proper gun safety.