But Victims of Crime Assistance League CEO Robyn Cotterell-Jones said the players' end-of-season choice was setting a poor example for children using the players as role models.
"Logic would say you'd be ashamed of your past and wouldn't dress yourself up to promote yourself in that way," she said.
"Dressing up in costume is great fun but in this situation it's not a good example for young people. They should be discouraging the idea that it is a good idea to be a criminal. It's too easy for young people to be misled."
Other players went a safer route, opting to dress as characters like Where's Wally and Popeye.
The team also took a jab at the NRL, with one player dressed as Braveheart's William Wallace and posting a photo captioned "#ucantakeourpointsbutucanttakeourfreedom".
The costume choice comes at the end of a disappointing year for the club, in which two players were warned by police for consorting with criminals and the club were deducted 12 competition points after salary cap breaches which led to their board being sacked.