To be fair that there are still schools and areas around where knives are just tools like any other - more so in rural areas though. There are still kindergardens around where the kids use knives as part of their outdoors activities from they are 4-5 years old or so.
More to the point. The law is the law here but how it is interpreted seems to vary wildly depending on region and situational setting. That might be more even in Australia? Having visited Australia a few times I reckon common sense might be more common than this thread give it credit for?
Common sense might be putting it a bit strongly, but....allocation of police resources is a consideration I guess.
In a town with large ice issues for example, you don't tend to find cops pulling people up for jaywalking. It's not just where they want to do their paperwork - they're hip deep in "real crimes" (and domestic violence) issues.
But...look at it this way - given the power to randomly search people for "weapons" - now they can "suspect" people of having weapons...and oh look, we didn't find one, but we did find some drugs. oh-ho-ho.
You might say "Good! Less drugs on the street!" - but...Well, the discussion of application and interpretation of police powers might get too spicy for MT.O.
Suffice to say - I think from now on, lots of people will be removing their classics from their keychain, to save the worry of potential issues.