Can't do that, Austrailia banned guns.
How about shoot them with a crossbow? No, they banned those also!
How about chop them up with a machete? No, they banned those also!
How about sticking them with a large knife or sword? Well, unfortunately they banned those also!
Guess they'll just have to use harsh language on them, (as long as it politcally correct speech that is!
Semper Fi!