Honestly, after scrolling through this thread, I gotta wonder when carrying a pocket knife became something abnormal to a decent percentage of the population.
It was never universal, but as young lad in the late 1900's it was unremarkable for most people to have at least a little pocket knife with a nail file on them most of the time and never anything sinister. There were places you couldn't take them, but for the most part we lived our lives surrounded by people with concealed knives and never thought twice about it.
Never tied an onion to my belt though.
EDIT: If it's mostly a backlash against the EDC crowd, I kinda get it, but still it seems pretty harmless in moderation.