It doesn’t have a safety?
Pretty sure Glocks don’t.
Somehow the firing pin “circumvented” the safety block. Uhuh.
No, Glock pistols don't have safeties; when 4 pounds of pressure touches that trigger, it fires.
I once knew a guy who kept his Glock 17 on the nightstand when he slept. One night a noise woke him, he grabbed his Glock, grabbed it the wrong way and shot himself.
I suspect something similar happened to the Chief.