[Atlas Sneezed]

To answer your question, the "safety" prevents discharge when a branch presses the main portion of the trigger, but does not prevent discharge when a branch presses the safety lever of the trigger.

Imagine trying the fire the gun (clamped in a vise) with a loop of string. If would be hard to get the string to rest on just the right spot of the trigger safety. I suspect that it the idea, so that non-finger-sized objects are unlikely to fire the gun.

I prefer a DA/SA setup that has a heavy first shot pull, and light pull for later shots.

[supercat]

I prefer a DA/SA setup that has a heavy first shot pull, and light pull for later shots.

The problem with that arrangement is that unless one deliberately 'does something' to the gun after shooting some (but not all) rounds, the firearm will remain in 'hair-trigger' mode.

One of the brilliant things about the Glock design is that the trigger may be released partially between follow-on shots, allowing them to be fired with a shorter trigger pull, but releasing the trigger fully returns the pistol to the normal degree of readiness.