It's called good design.
I appreciate that you idiot Yanks don't understand such things.
Not many people die of electrocution, fewer still from 120, and I'd
guess approximately none from contacting partially-inserted plugs.
With effort, you might manage a tingle, but nothing dangerous and
certainly nothing you'd seize up on. Chewing on cords is more
dangerous, but that's mostly dogs and cats; I'd imagine that 240 is
many times more dangerous than 120 in that regard, and GFD might not
help there.
The greatest advancement in electrical safety lately has been the
fiberglass ladder.
But Edison, Westinghouse, Tesla, and Steinmetz pretty much invented
electric power here, so your "idiot Yanks" comment is just your usual
jingoist crap. I guess everybody has to contrive a way to feel good
about themselves.
John