Aye, since the delights of Kill Bill and the Last Samurai, the proliferation of SLO's on peoples mantle-pieces has continued apace.
Certain unsavoury sorts have taken to using the katana for it's 'intimidation' value and there have been a couple of incidents involving people of unsound mind waving 'display' swords around in public arena's.
One poor mentally-ill chap got himself ventilated into the next stage of existence in my neck of the woods last year - what the media fail to mention is that why he got shot by the police was that he was also wielding a shotgun.
The actual number of incidents is vanishingly small but the media has done it's normal thing, as you expressed it so well, of turning the katana into an 'evil boogeyman' that no upstanding citizen would wish to own.
If you read the government consultation White Paper on the issue, even the stats they quote in it do not support the actions being taken. It's just that the sword is something distinctive and easily identifiable in the public consciousness, so banning it shows that the government is being "tough on crime".
If it wasn't likely to be such a potential hinderance to my art it would be farcical.