re: the one who brought it up.
All knives have NOT "been made illegal", no one's even proposed it, and no, it is not "a matter of time" before it happens. That just couples so well with your paranoia.
From the original link:
The knife has a rounded edge instead of a point and will snag on clothing and skin to make it more difficult to stab someone.
It was invented by industrial designer John Cornock, who was inspired by a documentary in which doctors advocated banning traditional knives.
If you mean it hasn't been proposed by a legislator of some kind yet, instead of some looney academic, you're right, but again, I suspect it's only a matter of time.
The problem isn't the basic idea of regulation, which is where you and others are trying to pigeonhole me (do you WANT kids to have flamethrowers?). It's that I've seen no evidence that there's any kind of stopping point.