Especially ironic given nunchaku as a practical weapon is really not that great, especially in the hands of an amateur. A common kitchen knife or an iron rod (or even a good sturdy stick) would probably be more dangerous. It may be a great tool for a martial artist to develop valuable dexterity and speed skills, but as a practical weapon... It's common though for politicians to ban things out of sheer ignorance and following cultural stereotypes borrowed from fictional movies.