The term 'ban' does not have to be a legistration kind of ban. A call to ban something, can just be calling people to stop carrying/using stuff. Calling people to stop carrying things in a context where there is no other use then violence isn't really wrong in my mind.

Here is a example of a call to 'ban' something, I found last week during my trip in the UK. Pretty sure nobody will put that in legistration.