I'm not really interested in your little "Gotcha" game with the photos, but I've kept the safety hooks on my OOSs for several reasons:
First, they keep the jaws from snatching up dirt and grass when I trip the empties to pull. No need to fear dry-fires, a bane of the newer Chinese OOSs with inconsistent jaw spacing.
Second, setting them from "safe" the way I do with a trowel handle requires a shorter arc which saves time and effort. Heck, I can even speedset by stepping on one jaw and pulling up on the opposite. No lever or trowel needed.
I spend the time it would take to tear off the safety by tweaking that sloppy pan, which probably accounts for more misses than we realize.
I always (except that first spring job!) remember to flip the safety; it's part of my setting routine. So, in a way, I guess you're right: only idiots will leave the safety on.