Maybe worth politely suggesting to them that if council sees them parked like that then it'll likely set them back over $100 in fines for each offence, let alone if Vic Police spot them driving against the direction of traffic on the wrong side of the road. Also, if someone happens to hit their car whilst it's parked facing the wrong way, their insurer will refuse any claims due to the vehicle being parked illegally and they'd ultimately be responsible for out-of-pocket repairs to both their own vehicle and that of the vehicle that hit them.
