I, respectfully, disagree. The safety of the Garand type trigger group can not fail. It's either there, or it's not... Unless there is some sort of sabotage. I use it every time I walk away from it at cold range. No mag, bolt open, and yes safety is on. Safety is more for who may grab my firearm than myself.
If it has been designed with a safety, it should be taught. Unless you are smarter than the designer.
"The very atmosphere of firearms anywhere and everywhere restrains evil interference - they deserve a place of honor with all that's good." -George Washington